20555513525 has 24 divisors (see below), whose sum is σ = 25869326400. Its totient is φ = 16199321600.

The previous prime is 20555513479. The next prime is 20555513533. The reversal of 20555513525 is 52531555502.

It is not a de Polignac number, because 20555513525 - 2³² = 16260546229 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2496866 + ... + 2505084.

It is an arithmetic number, because the mean of its divisors is an integer number (1077888600).

Almost surely, 2^20555513525 is an apocalyptic number.

20555513525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20555513525 is a deficient number, since it is larger than the sum of its proper divisors (5313812875).

20555513525 is a wasteful number, since it uses less digits than its factorization.

20555513525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9709 (or 9704 counting only the distinct ones).

The product of its (nonzero) digits is 187500, while the sum is 38.

The spelling of 20555513525 in words is "twenty billion, five hundred fifty-five million, five hundred thirteen thousand, five hundred twenty-five".