20966923 has 2 divisors, whose sum is σ = 20966924. Its totient is φ = 20966922.

The previous prime is 20966921. The next prime is 20966951. The reversal of 20966923 is 32966902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20966923 - 2¹ = 20966921 is a prime.

It is a super-2 number, since 2×20966923² = 879223720175858, which contains 22 as substring.

Together with 20966921, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20966921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10483461 + 10483462.

It is an arithmetic number, because the mean of its divisors is an integer number (10483462).

Almost surely, 2^20966923 is an apocalyptic number.

20966923 is a deficient number, since it is larger than the sum of its proper divisors (1).

20966923 is an equidigital number, since it uses as much as digits as its factorization.

20966923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 20966923 is about 4578.9652761295. The cubic root of 20966923 is about 275.7474892417.

The spelling of 20966923 in words is "twenty million, nine hundred sixty-six thousand, nine hundred twenty-three".