20922657 has 16 divisors (see below), whose sum is σ = 32534400. Its totient is φ = 11955216.

The previous prime is 20922647. The next prime is 20922677. The reversal of 20922657 is 75622902.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20922657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20922637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9138 + ... + 11195.

It is an arithmetic number, because the mean of its divisors is an integer number (2033400).

Almost surely, 2^20922657 is an apocalyptic number.

It is an amenable number.

20922657 is a deficient number, since it is larger than the sum of its proper divisors (11611743).

20922657 is an equidigital number, since it uses as much as digits as its factorization.

20922657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20357 (or 20343 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 20922657 is about 4574.1290974348. The cubic root of 20922657 is about 275.5532970450.

The spelling of 20922657 in words is "twenty million, nine hundred twenty-two thousand, six hundred fifty-seven".