20772657 has 24 divisors (see below), whose sum is σ = 33156864. Its totient is φ = 12465024.

The previous prime is 20772641. The next prime is 20772667. The reversal of 20772657 is 75627702.

It is not a de Polignac number, because 20772657 - 2⁴ = 20772641 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20772607) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 568 + ... + 6470.

It is an arithmetic number, because the mean of its divisors is an integer number (1381536).

Almost surely, 2^20772657 is an apocalyptic number.

It is an amenable number.

20772657 is a deficient number, since it is larger than the sum of its proper divisors (12384207).

20772657 is a wasteful number, since it uses less digits than its factorization.

20772657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5949 (or 5946 counting only the distinct ones).

The product of its (nonzero) digits is 41160, while the sum is 36.

The square root of 20772657 is about 4557.7030399095. The cubic root of 20772657 is about 274.8932125324.

The spelling of 20772657 in words is "twenty million, seven hundred seventy-two thousand, six hundred fifty-seven".