20312923 has 2 divisors, whose sum is σ = 20312924. Its totient is φ = 20312922.

The previous prime is 20312921. The next prime is 20312951. The reversal of 20312923 is 32921302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20312923 - 2¹ = 20312921 is a prime.

It is a super-2 number, since 2×20312923² = 825229681607858, which contains 22 as substring.

Together with 20312921, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20312894 and 20312903.

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, 10156461 + 10156462.

It is an arithmetic number, because the mean of its divisors is an integer number (10156462).

Almost surely, 2^20312923 is an apocalyptic number.

20312923 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312923 is an equidigital number, since it uses as much as digits as its factorization.

20312923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20312923 is about 4506.9860217223. The cubic root of 20312923 is about 272.8501147385.

The spelling of 20312923 in words is "twenty million, three hundred twelve thousand, nine hundred twenty-three".