20923238 has 32 divisors (see below), whose sum is σ = 37739520. Its totient is φ = 8506080.

The previous prime is 20923207. The next prime is 20923247. The reversal of 20923238 is 83232902.

It is a self number, because there is not a number n which added to its sum of digits gives 20923238.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58103 + ... + 58461.

It is an arithmetic number, because the mean of its divisors is an integer number (1179360).

Almost surely, 2^20923238 is an apocalyptic number.

20923238 is a deficient number, since it is larger than the sum of its proper divisors (16816282).

20923238 is a wasteful number, since it uses less digits than its factorization.

20923238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 20923238 is about 4574.1926063514. The cubic root of 20923238 is about 275.5558476290. Note that the first 3 decimals are identical.

The spelling of 20923238 in words is "twenty million, nine hundred twenty-three thousand, two hundred thirty-eight".