20656911407 has 16 divisors (see below), whose sum is σ = 22653596160. Its totient is φ = 18680277600.

The previous prime is 20656911377. The next prime is 20656911419. The reversal of 20656911407 is 70411965602.

It is a cyclic number.

It is not a de Polignac number, because 20656911407 - 2¹² = 20656907311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20656911467) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1735358 + ... + 1747220.

It is an arithmetic number, because the mean of its divisors is an integer number (1415849760).

Almost surely, 2^20656911407 is an apocalyptic number.

20656911407 is a deficient number, since it is larger than the sum of its proper divisors (1996684753).

20656911407 is a wasteful number, since it uses less digits than its factorization.

20656911407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12694.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 20656911407 in words is "twenty billion, six hundred fifty-six million, nine hundred eleven thousand, four hundred seven".