20720405313 has 40 divisors (see below), whose sum is σ = 31867717728. Its totient is φ = 13409214336.

The previous prime is 20720405311. The next prime is 20720405357. The reversal of 20720405313 is 31350402702.

20720405313 is a `hidden beast` number, since 20 + 72 + 0 + 40 + 531 + 3 = 666.

It is not a de Polignac number, because 20720405313 - 2¹ = 20720405311 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20720405311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 549481 + ... + 585977.

Almost surely, 2^20720405313 is an apocalyptic number.

It is an amenable number.

20720405313 is a deficient number, since it is larger than the sum of its proper divisors (11147312415).

20720405313 is a wasteful number, since it uses less digits than its factorization.

20720405313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36715 (or 36706 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The spelling of 20720405313 in words is "twenty billion, seven hundred twenty million, four hundred five thousand, three hundred thirteen".