20868979707 has 12 divisors (see below), whose sum is σ = 31730612680. Its totient is φ = 13180408128.

The previous prime is 20868979699. The next prime is 20868979717. The reversal of 20868979707 is 70797986802.

It is not a de Polignac number, because 20868979707 - 2³ = 20868979699 is a prime.

It is a super-2 number, since 2×20868979707² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20868979717) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61020238 + ... + 61020579.

Almost surely, 2^20868979707 is an apocalyptic number.

20868979707 is a deficient number, since it is larger than the sum of its proper divisors (10861632973).

20868979707 is a wasteful number, since it uses less digits than its factorization.

20868979707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122040842 (or 122040839 counting only the distinct ones).

The product of its (nonzero) digits is 21337344, while the sum is 63.

The spelling of 20868979707 in words is "twenty billion, eight hundred sixty-eight million, nine hundred seventy-nine thousand, seven hundred seven".