20212931 has 2 divisors, whose sum is σ = 20212932. Its totient is φ = 20212930.

The previous prime is 20212909. The next prime is 20212937. The reversal of 20212931 is 13921202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20212931 - 2²² = 16018627 is a prime.

It is a super-2 number, since 2×20212931² = 817125159221522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20212937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106465 + 10106466.

It is an arithmetic number, because the mean of its divisors is an integer number (10106466).

Almost surely, 2^20212931 is an apocalyptic number.

20212931 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212931 is an equidigital number, since it uses as much as digits as its factorization.

20212931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20212931 is about 4495.8793355694. The cubic root of 20212931 is about 272.4016692044.

The spelling of 20212931 in words is "twenty million, two hundred twelve thousand, nine hundred thirty-one".