20004356657525 has 6 divisors (see below), whose sum is σ = 24805402255362. Its totient is φ = 16003485326000.

The previous prime is 20004356657489. The next prime is 20004356657531. The reversal of 20004356657525 is 52575665340002.

It can be written as a sum of positive squares in 3 ways, for example, as 465463698001 + 19538892959524 = 682249^2 + 4420282^2 .

It is not a de Polignac number, because 20004356657525 - 2¹⁸ = 20004356395381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 400087133126 + ... + 400087133175.

It is an arithmetic number, because the mean of its divisors is an integer number (4134233709227).

Almost surely, 2^{20004356657525} is an apocalyptic number.

20004356657525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20004356657525 is a deficient number, since it is larger than the sum of its proper divisors (4801045597837).

20004356657525 is an equidigital number, since it uses as much as digits as its factorization.

20004356657525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800174266311 (or 800174266306 counting only the distinct ones).

The product of its (nonzero) digits is 7560000, while the sum is 50.

The spelling of 20004356657525 in words is "twenty trillion, four billion, three hundred fifty-six million, six hundred fifty-seven thousand, five hundred twenty-five".