20312911 has 2 divisors, whose sum is σ = 20312912. Its totient is φ = 20312910.

The previous prime is 20312869. The next prime is 20312921. The reversal of 20312911 is 11921302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20312911 - 2⁷ = 20312783 is a prime.

It is a super-2 number, since 2×20312911² = 825228706587842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20312921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156455 + 10156456.

It is an arithmetic number, because the mean of its divisors is an integer number (10156456).

Almost surely, 2^20312911 is an apocalyptic number.

20312911 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312911 is an equidigital number, since it uses as much as digits as its factorization.

20312911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 20312911 is about 4506.9846904555. The cubic root of 20312911 is about 272.8500610092.

The spelling of 20312911 in words is "twenty million, three hundred twelve thousand, nine hundred eleven".