20922917 has 4 divisors (see below), whose sum is σ = 20933580. Its totient is φ = 20912256.

The previous prime is 20922911. The next prime is 20922931. The reversal of 20922917 is 71922902.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4268356 + 16654561 = 2066^2 + 4081^2 .

It is a cyclic number.

It is not a de Polignac number, because 20922917 - 2⁴ = 20922901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20922911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1442 + ... + 6627.

It is an arithmetic number, because the mean of its divisors is an integer number (5233395).

Almost surely, 2^20922917 is an apocalyptic number.

It is an amenable number.

20922917 is a deficient number, since it is larger than the sum of its proper divisors (10663).

20922917 is an equidigital number, since it uses as much as digits as its factorization.

20922917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10662.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 20922917 is about 4574.1575180573. The cubic root of 20922917 is about 275.5544384481.

The spelling of 20922917 in words is "twenty million, nine hundred twenty-two thousand, nine hundred seventeen".