20311312525 has 24 divisors (see below), whose sum is σ = 28819724864. Its totient is φ = 13910486400.

The previous prime is 20311312517. The next prime is 20311312543. The reversal of 20311312525 is 52521311302.

It is not a de Polignac number, because 20311312525 - 2³ = 20311312517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 20311312525.

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, 70369 + ... + 213481.

Almost surely, 2^20311312525 is an apocalyptic number.

20311312525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20311312525 is a deficient number, since it is larger than the sum of its proper divisors (8508412339).

20311312525 is a wasteful number, since it uses less digits than its factorization.

20311312525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143941 (or 143936 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 20311312525 its reverse (52521311302), we get a palindrome (72832623827).

The spelling of 20311312525 in words is "twenty billion, three hundred eleven million, three hundred twelve thousand, five hundred twenty-five".