20888138 has 16 divisors (see below), whose sum is σ = 33312384. Its totient is φ = 9789120.

The previous prime is 20888123. The next prime is 20888143. The reversal of 20888138 is 83188802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8081 + ... + 10347.

It is an arithmetic number, because the mean of its divisors is an integer number (2082024).

Almost surely, 2^20888138 is an apocalyptic number.

20888138 is a deficient number, since it is larger than the sum of its proper divisors (12424246).

20888138 is a wasteful number, since it uses less digits than its factorization.

20888138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557.

The product of its (nonzero) digits is 24576, while the sum is 38.

The square root of 20888138 is about 4570.3542532281. The cubic root of 20888138 is about 275.4016741727.

The spelling of 20888138 in words is "twenty million, eight hundred eighty-eight thousand, one hundred thirty-eight".