20764231 has 2 divisors, whose sum is σ = 20764232. Its totient is φ = 20764230.

The previous prime is 20764229. The next prime is 20764243. The reversal of 20764231 is 13246702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20764231 - 2¹ = 20764229 is a prime.

It is a super-2 number, since 2×20764231² = 862306578042722, which contains 22 as substring.

Together with 20764229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20764196 and 20764205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20765231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10382115 + 10382116.

It is an arithmetic number, because the mean of its divisors is an integer number (10382116).

Almost surely, 2^20764231 is an apocalyptic number.

20764231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20764231 is an equidigital number, since it uses as much as digits as its factorization.

20764231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20764231 is about 4556.7785770213. The cubic root of 20764231 is about 274.8560392512.

The spelling of 20764231 in words is "twenty million, seven hundred sixty-four thousand, two hundred thirty-one".