20312238 has 32 divisors (see below), whose sum is σ = 42456960. Its totient is φ = 6470240.

The previous prime is 20312233. The next prime is 20312239. The reversal of 20312238 is 83221302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18073 + ... + 19163.

It is an arithmetic number, because the mean of its divisors is an integer number (1326780).

Almost surely, 2^20312238 is an apocalyptic number.

20312238 is an abundant number, since it is smaller than the sum of its proper divisors (22144722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20312238 is a wasteful number, since it uses less digits than its factorization.

20312238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20312238 is about 4506.9100279460. The cubic root of 20312238 is about 272.8470476528.

The spelling of 20312238 in words is "twenty million, three hundred twelve thousand, two hundred thirty-eight".