20995590825 has 240 divisors, whose sum is σ = 44801703936. Its totient is φ = 9620899200.

The previous prime is 20995590823. The next prime is 20995590859. The reversal of 20995590825 is 52809559902.

20995590825 is a `hidden beast` number, since 2 + 0 + 9 + 9 + 559 + 0 + 82 + 5 = 666.

It is not a de Polignac number, because 20995590825 - 2¹ = 20995590823 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20995590823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 54818584 + ... + 54818966.

Almost surely, 2^20995590825 is an apocalyptic number.

20995590825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20995590825 is an abundant number, since it is smaller than the sum of its proper divisors (23806113111).

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

20995590825 is a wasteful number, since it uses less digits than its factorization.

20995590825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 2916000, while the sum is 54.

The spelling of 20995590825 in words is "twenty billion, nine hundred ninety-five million, five hundred ninety thousand, eight hundred twenty-five".