20932591761 has 27 divisors (see below), whose sum is σ = 31333379259. Its totient is φ = 13465750032.

The previous prime is 20932591723. The next prime is 20932591763. The reversal of 20932591761 is 16719523902.

It is a happy number.

The square root of 20932591761 is 144681.

It is a perfect power (a square), and thus also a powerful number.

20932591761 is a `hidden beast` number, since 20 + 9 + 32 + 591 + 7 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10976543361 + 9956048400 = 104769^2 + 99780^2 .

It is not a de Polignac number, because 20932591761 - 2⁷ = 20932591633 is a prime.

It is a super-2 number, since 2×20932591761² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20932591763) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 12586416 + ... + 12588078.

Almost surely, 2^20932591761 is an apocalyptic number.

20932591761 is the 144681-st square number.

20932591761 is the 72341-st centered octagonal number.

It is an amenable number.

20932591761 is a deficient number, since it is larger than the sum of its proper divisors (10400787498).

20932591761 is an frugal number, since it uses more digits than its factorization.

20932591761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3390 (or 1695 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The spelling of 20932591761 in words is "twenty billion, nine hundred thirty-two million, five hundred ninety-one thousand, seven hundred sixty-one".