20312885560 has 64 divisors (see below), whose sum is σ = 52483075200. Its totient is φ = 6997737600.

The previous prime is 20312885539. The next prime is 20312885561. The reversal of 20312885560 is 6558821302.

It is a super-2 number, since 2×20312885560² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312885561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1206526 + ... + 1223245.

It is an arithmetic number, because the mean of its divisors is an integer number (820048050).

Almost surely, 2^20312885560 is an apocalyptic number.

20312885560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20312885560 is an abundant number, since it is smaller than the sum of its proper divisors (32170189640).

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

20312885560 is a wasteful number, since it uses less digits than its factorization.

20312885560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2429812 (or 2429808 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 20312885560 in words is "twenty billion, three hundred twelve million, eight hundred eighty-five thousand, five hundred sixty".