20937708861 has 32 divisors (see below), whose sum is σ = 29834179200. Its totient is φ = 13015541760.

The previous prime is 20937708761. The next prime is 20937708923. The reversal of 20937708861 is 16880773902.

It is a de Polignac number, because none of the positive numbers 2^k-20937708861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20937708161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3690535 + ... + 3696203.

It is an arithmetic number, because the mean of its divisors is an integer number (932318100).

Almost surely, 2^20937708861 is an apocalyptic number.

It is an amenable number.

20937708861 is a deficient number, since it is larger than the sum of its proper divisors (8896470339).

20937708861 is a wasteful number, since it uses less digits than its factorization.

20937708861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6349.

The product of its (nonzero) digits is 1016064, while the sum is 51.

The spelling of 20937708861 in words is "twenty billion, nine hundred thirty-seven million, seven hundred eight thousand, eight hundred sixty-one".