20369657 has 16 divisors (see below), whose sum is σ = 25608192. Its totient is φ = 15739920.

The previous prime is 20369639. The next prime is 20369677. The reversal of 20369657 is 75696302.

It is not a de Polignac number, because 20369657 - 2¹⁰ = 20368633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20369657.

It is not an unprimeable number, because it can be changed into a prime (20369617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8738 + ... + 10820.

It is an arithmetic number, because the mean of its divisors is an integer number (1600512).

Almost surely, 2^20369657 is an apocalyptic number.

It is an amenable number.

20369657 is a deficient number, since it is larger than the sum of its proper divisors (5238535).

20369657 is a wasteful number, since it uses less digits than its factorization.

20369657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 20369657 is about 4513.2756397100. The cubic root of 20369657 is about 273.1039020929.

The spelling of 20369657 in words is "twenty million, three hundred sixty-nine thousand, six hundred fifty-seven".