20724896625 has 32 divisors (see below), whose sum is σ = 34496886528. Its totient is φ = 11049862400.

The previous prime is 20724896593. The next prime is 20724896681. The reversal of 20724896625 is 52669842702.

It is a happy number.

It is not a de Polignac number, because 20724896625 - 2⁵ = 20724896593 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1620004 + ... + 1632746.

It is an arithmetic number, because the mean of its divisors is an integer number (1078027704).

Almost surely, 2^20724896625 is an apocalyptic number.

20724896625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20724896625 is a deficient number, since it is larger than the sum of its proper divisors (13771989903).

20724896625 is a wasteful number, since it uses less digits than its factorization.

20724896625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17098 (or 17088 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 20724896625 in words is "twenty billion, seven hundred twenty-four million, eight hundred ninety-six thousand, six hundred twenty-five".