20554660625 has 20 divisors (see below), whose sum is σ = 25702288260. Its totient is φ = 16432728000.

The previous prime is 20554660619. The next prime is 20554660649. The reversal of 20554660625 is 52606645502.

It can be written as a sum of positive squares in 10 ways, for example, as 8909660881 + 11644999744 = 94391^2 + 107912^2 .

It is not a de Polignac number, because 20554660625 - 2⁸ = 20554660369 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 997931 + ... + 1018319.

It is an arithmetic number, because the mean of its divisors is an integer number (1285114413).

Almost surely, 2^20554660625 is an apocalyptic number.

20554660625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20554660625 is a deficient number, since it is larger than the sum of its proper divisors (5147627635).

20554660625 is an equidigital number, since it uses as much as digits as its factorization.

20554660625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22022 (or 22007 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 20554660625 in words is "twenty billion, five hundred fifty-four million, six hundred sixty thousand, six hundred twenty-five".