Base | Representation |
---|---|
bin | 10011000001110101… |
… | …011111100011111100 |
3 | 1221201221012210111201 |
4 | 103001311133203330 |
5 | 313321031113110 |
6 | 13215234225244 |
7 | 1322215145233 |
oct | 230165374374 |
9 | 57657183451 |
10 | 20431894780 |
11 | 87352a9a60 |
12 | 3b62725224 |
13 | 1c0800578b |
14 | dbb7cdb1a |
15 | 7e8b2eb3a |
hex | 4c1d5f8fc |
20431894780 has 48 divisors (see below), whose sum is σ = 48317552640. Its totient is φ = 7190107200.
The previous prime is 20431894753. The next prime is 20431894799. The reversal of 20431894780 is 8749813402.
It is a self number, because there is not a number n which added to its sum of digits gives 20431894780.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1491120 + ... + 1504759.
It is an arithmetic number, because the mean of its divisors is an integer number (1006615680).
Almost surely, 220431894780 is an apocalyptic number.
20431894780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
20431894780 is an abundant number, since it is smaller than the sum of its proper divisors (27885657860).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20431894780 is a wasteful number, since it uses less digits than its factorization.
20431894780 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2995930 (or 2995928 counting only the distinct ones).
The product of its (nonzero) digits is 387072, while the sum is 46.
The spelling of 20431894780 in words is "twenty billion, four hundred thirty-one million, eight hundred ninety-four thousand, seven hundred eighty".
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