20390858525 has 12 divisors (see below), whose sum is σ = 25292657952. Its totient is φ = 16307529840.

The previous prime is 20390858503. The next prime is 20390858557. The reversal of 20390858525 is 52585809302.

It is a happy number.

It is not a de Polignac number, because 20390858525 - 2²⁰ = 20389809949 is a prime.

It is a super-2 number, since 2×20390858525² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20390858525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47249 + ... + 207398.

It is an arithmetic number, because the mean of its divisors is an integer number (2107721496).

Almost surely, 2^20390858525 is an apocalyptic number.

20390858525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20390858525 is a deficient number, since it is larger than the sum of its proper divisors (4901799427).

20390858525 is a wasteful number, since it uses less digits than its factorization.

20390858525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257860 (or 257855 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 47.

The spelling of 20390858525 in words is "twenty billion, three hundred ninety million, eight hundred fifty-eight thousand, five hundred twenty-five".