20937965567 has 16 divisors (see below), whose sum is σ = 22414940352. Its totient is φ = 19509684480.

The previous prime is 20937965551. The next prime is 20937965623. The reversal of 20937965567 is 76556973902.

It is a cyclic number.

It is not a de Polignac number, because 20937965567 - 2⁴ = 20937965551 is a prime.

It is a plaindrome in base 8 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20937965537) 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, 622013 + ... + 654809.

It is an arithmetic number, because the mean of its divisors is an integer number (1400933772).

Almost surely, 2^20937965567 is an apocalyptic number.

20937965567 is a deficient number, since it is larger than the sum of its proper divisors (1476974785).

20937965567 is a wasteful number, since it uses less digits than its factorization.

20937965567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33538.

The product of its (nonzero) digits is 21432600, while the sum is 59.

The spelling of 20937965567 in words is "twenty billion, nine hundred thirty-seven million, nine hundred sixty-five thousand, five hundred sixty-seven".