20764431 has 20 divisors (see below), whose sum is σ = 31145400. Its totient is φ = 13786416.

The previous prime is 20764427. The next prime is 20764487. The reversal of 20764431 is 13446702.

It is not a de Polignac number, because 20764431 - 2² = 20764427 is a prime.

It is a super-2 number, since 2×20764431² = 862323189507522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20764395 and 20764404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20764421) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 31180 + ... + 31838.

It is an arithmetic number, because the mean of its divisors is an integer number (1557270).

Almost surely, 2^20764431 is an apocalyptic number.

20764431 is a deficient number, since it is larger than the sum of its proper divisors (10380969).

20764431 is an equidigital number, since it uses as much as digits as its factorization.

20764431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060 (or 1051 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 20764431 is about 4556.8005222963. The cubic root of 20764431 is about 274.8569217147.

The spelling of 20764431 in words is "twenty million, seven hundred sixty-four thousand, four hundred thirty-one".