20312000520 has 128 divisors (see below), whose sum is σ = 73737734400. Its totient is φ = 4369637376.

The previous prime is 20312000479. The next prime is 20312000563. The reversal of 20312000520 is 2500021302.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20312000520.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 696925 + ... + 725484.

It is an arithmetic number, because the mean of its divisors is an integer number (576076050).

Almost surely, 2^20312000520 is an apocalyptic number.

20312000520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20312000520 is an abundant number, since it is smaller than the sum of its proper divisors (53425733880).

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

20312000520 is a wasteful number, since it uses less digits than its factorization.

20312000520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422447 (or 1422443 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

Adding to 20312000520 its reverse (2500021302), we get a palindrome (22812021822).

The spelling of 20312000520 in words is "twenty billion, three hundred twelve million, five hundred twenty", and thus it is an aban number.