20007900 has 216 divisors, whose sum is σ = 71495424. Its totient is φ = 4636800.

The previous prime is 20007881. The next prime is 20007919. The reversal of 20007900 is 970002.

It is an interprime number because it is at equal distance from previous prime (20007881) and next prime (20007919).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 425677 + ... + 425723.

Almost surely, 2^20007900 is an apocalyptic number.

20007900 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 20007900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35747712).

20007900 is an abundant number, since it is smaller than the sum of its proper divisors (51487524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20007900 is a wasteful number, since it uses less digits than its factorization.

20007900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 20007900 is about 4473.0191146473. The cubic root of 20007900 is about 271.4774967867.

Adding to 20007900 its reverse (970002), we get a palindrome (20977902).

The spelling of 20007900 in words is "twenty million, seven thousand, nine hundred".