20390438525 has 24 divisors (see below), whose sum is σ = 26989790400. Its totient is φ = 15236121600.

The previous prime is 20390438513. The next prime is 20390438531. The reversal of 20390438525 is 52583409302.

It is not a de Polignac number, because 20390438525 - 2⁶ = 20390438461 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 268580 + ... + 336029.

It is an arithmetic number, because the mean of its divisors is an integer number (1124574600).

Almost surely, 2^20390438525 is an apocalyptic number.

20390438525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20390438525 is a deficient number, since it is larger than the sum of its proper divisors (6599351875).

20390438525 is a wasteful number, since it uses less digits than its factorization.

20390438525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604709 (or 604704 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 20390438525 in words is "twenty billion, three hundred ninety million, four hundred thirty-eight thousand, five hundred twenty-five".