| Base | Representation |
|---|---|
| bin | 100110010101… |
| … | …1110101100100 |
| 3 | 1101211022110001 |
| 4 | 1030223311210 |
| 5 | 20121240000 |
| 6 | 1554511044 |
| 7 | 332603605 |
| oct | 114536544 |
| 9 | 41738401 |
| 10 | 20102500 |
| 11 | 10390340 |
| 12 | 6895484 |
| 13 | 421ac92 |
| 14 | 2953dac |
| 15 | 1b7146a |
| hex | 132bd64 |
20102500 has 120 divisors (see below), whose sum is σ = 51958368. Its totient is φ = 6720000.
The previous prime is 20102497. The next prime is 20102503. The reversal of 20102500 is 520102.
It is an interprime number because it is at equal distance from previous prime (20102497) and next prime (20102503).
It is a super-2 number, since 2×201025002 = 808221012500000, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (10).
It is not an unprimeable number, because it can be changed into a prime (20102503) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 467479 + ... + 467521.
Almost surely, 220102500 is an apocalyptic number.
20102500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 20102500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25979184).
20102500 is an abundant number, since it is smaller than the sum of its proper divisors (31855868).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20102500 is a wasteful number, since it uses less digits than its factorization.
20102500 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 95 (or 78 counting only the distinct ones).
The product of its (nonzero) digits is 20, while the sum is 10.
The square root of 20102500 is about 4483.5811579584. The cubic root of 20102500 is about 271.9046847404.
Adding to 20102500 its reverse (520102), we get a palindrome (20622602).
It can be divided in two parts, 20102 and 500, that added together give a palindrome (20602).
The spelling of 20102500 in words is "twenty million, one hundred two thousand, five hundred".
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