20631238 has 16 divisors (see below), whose sum is σ = 32562000. Its totient is φ = 9789472.

The previous prime is 20631229. The next prime is 20631263. The reversal of 20631238 is 83213602.

It is a congruent number.

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, 408 + ... + 6436.

It is an arithmetic number, because the mean of its divisors is an integer number (2035125).

Almost surely, 2^20631238 is an apocalyptic number.

20631238 is a deficient number, since it is larger than the sum of its proper divisors (11930762).

20631238 is a wasteful number, since it uses less digits than its factorization.

20631238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6119.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20631238 is about 4542.1622604218. The cubic root of 20631238 is about 274.2679726919.

The spelling of 20631238 in words is "twenty million, six hundred thirty-one thousand, two hundred thirty-eight".