20388051 has 16 divisors (see below), whose sum is σ = 31518720. Its totient is φ = 13000680.

The previous prime is 20388047. The next prime is 20388061. The reversal of 20388051 is 15088302.

It is a happy number.

It is not a de Polignac number, because 20388051 - 2² = 20388047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20388061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15795 + ... + 17036.

It is an arithmetic number, because the mean of its divisors is an integer number (1969920).

Almost surely, 2^20388051 is an apocalyptic number.

20388051 is a deficient number, since it is larger than the sum of its proper divisors (11130669).

20388051 is a wasteful number, since it uses less digits than its factorization.

20388051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32863 (or 32857 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 20388051 is about 4515.3129459651. The cubic root of 20388051 is about 273.1860825284.

The spelling of 20388051 in words is "twenty million, three hundred eighty-eight thousand, fifty-one".