20717137107 has 24 divisors (see below), whose sum is σ = 30664342800. Its totient is φ = 13470289920.

The previous prime is 20717137099. The next prime is 20717137117. The reversal of 20717137107 is 70173171702.

It is not a de Polignac number, because 20717137107 - 2³ = 20717137099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20717137117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1505683 + ... + 1519379.

It is an arithmetic number, because the mean of its divisors is an integer number (1277680950).

Almost surely, 2^20717137107 is an apocalyptic number.

20717137107 is a deficient number, since it is larger than the sum of its proper divisors (9947205693).

20717137107 is a wasteful number, since it uses less digits than its factorization.

20717137107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17843 (or 17840 counting only the distinct ones).

The product of its (nonzero) digits is 14406, while the sum is 36.

The spelling of 20717137107 in words is "twenty billion, seven hundred seventeen million, one hundred thirty-seven thousand, one hundred seven".