20388669 has 16 divisors (see below), whose sum is σ = 32071680. Its totient is φ = 11274480.

The previous prime is 20388583. The next prime is 20388727. The reversal of 20388669 is 96688302.

It is not a de Polignac number, because 20388669 - 2⁸ = 20388413 is a prime.

It is a super-2 number, since 2×20388669² = 831395647183122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20388669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20388469) 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, 15009 + ... + 16310.

It is an arithmetic number, because the mean of its divisors is an integer number (2004480).

Almost surely, 2^20388669 is an apocalyptic number.

It is an amenable number.

20388669 is a deficient number, since it is larger than the sum of its proper divisors (11683011).

20388669 is a wasteful number, since it uses less digits than its factorization.

20388669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31360.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 20388669 is about 4515.3813792414. The cubic root of 20388669 is about 273.1888427611.

The spelling of 20388669 in words is "twenty million, three hundred eighty-eight thousand, six hundred sixty-nine".