20315686540 has 36 divisors (see below), whose sum is σ = 45026555616. Its totient is φ = 7698573216.

The previous prime is 20315686519. The next prime is 20315686609. The reversal of 20315686540 is 4568651302.

It is a junction number, because it is equal to n+sod(n) for n = 20315686493 and 20315686502.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1399684 + ... + 1414123.

It is an arithmetic number, because the mean of its divisors is an integer number (1250737656).

Almost surely, 2^20315686540 is an apocalyptic number.

20315686540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20315686540 is an abundant number, since it is smaller than the sum of its proper divisors (24710869076).

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

20315686540 is a wasteful number, since it uses less digits than its factorization.

20315686540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2813854 (or 2813833 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 20315686540 in words is "twenty billion, three hundred fifteen million, six hundred eighty-six thousand, five hundred forty".