20388951 has 12 divisors (see below), whose sum is σ = 32128200. Its totient is φ = 12356880.

The previous prime is 20388947. The next prime is 20388989. The reversal of 20388951 is 15988302.

It is not a de Polignac number, because 20388951 - 2² = 20388947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20388451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102876 + ... + 103073.

It is an arithmetic number, because the mean of its divisors is an integer number (2677350).

Almost surely, 2^20388951 is an apocalyptic number.

20388951 is a deficient number, since it is larger than the sum of its proper divisors (11739249).

20388951 is a wasteful number, since it uses less digits than its factorization.

20388951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205966 (or 205963 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 20388951 is about 4515.4126057316. The cubic root of 20388951 is about 273.1901022662.

The spelling of 20388951 in words is "twenty million, three hundred eighty-eight thousand, nine hundred fifty-one".