20765631 has 4 divisors (see below), whose sum is σ = 27687512. Its totient is φ = 13843752.

The previous prime is 20765617. The next prime is 20765669. The reversal of 20765631 is 13656702.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20765631 - 2⁵ = 20765599 is a prime.

It is a super-2 number, since 2×20765631² = 862422861656322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20765231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3460936 + ... + 3460941.

It is an arithmetic number, because the mean of its divisors is an integer number (6921878).

Almost surely, 2^20765631 is an apocalyptic number.

20765631 is a deficient number, since it is larger than the sum of its proper divisors (6921881).

20765631 is an equidigital number, since it uses as much as digits as its factorization.

20765631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6921880.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 20765631 is about 4556.9321917272. The cubic root of 20765631 is about 274.8622163771.

The spelling of 20765631 in words is "twenty million, seven hundred sixty-five thousand, six hundred thirty-one".