20515376800 has 72 divisors (see below), whose sum is σ = 50477769216. Its totient is φ = 8141495040.

The previous prime is 20515376779. The next prime is 20515376911. The reversal of 20515376800 is 867351502.

It is a self number, because there is not a number n which added to its sum of digits gives 20515376800.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 639 + ... + 202561.

It is an arithmetic number, because the mean of its divisors is an integer number (701080128).

Almost surely, 2^20515376800 is an apocalyptic number.

20515376800 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 20515376800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25238884608).

20515376800 is an abundant number, since it is smaller than the sum of its proper divisors (29962392416).

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

20515376800 is a wasteful number, since it uses less digits than its factorization.

20515376800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202070 (or 202057 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 20515376800 in words is "twenty billion, five hundred fifteen million, three hundred seventy-six thousand, eight hundred".