20957769 has 24 divisors (see below), whose sum is σ = 34931520. Its totient is φ = 11860128.

The previous prime is 20957731. The next prime is 20957777. The reversal of 20957769 is 96775902.

It is not a de Polignac number, because 20957769 - 2¹⁷ = 20826697 is a prime.

It is a super-2 number, since 2×20957769² = 878456162914722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20957369) 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, 5187 + ... + 8295.

It is an arithmetic number, because the mean of its divisors is an integer number (1455480).

Almost surely, 2^20957769 is an apocalyptic number.

It is an amenable number.

20957769 is a deficient number, since it is larger than the sum of its proper divisors (13973751).

20957769 is a wasteful number, since it uses less digits than its factorization.

20957769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3229 (or 3226 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The square root of 20957769 is about 4577.9655962010. The cubic root of 20957769 is about 275.7073536441.

The spelling of 20957769 in words is "twenty million, nine hundred fifty-seven thousand, seven hundred sixty-nine".