20312316 has 48 divisors (see below), whose sum is σ = 54369280. Its totient is φ = 6551280.

The previous prime is 20312309. The next prime is 20312351. The reversal of 20312316 is 61321302.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 315 + ... + 6381.

Almost surely, 2^20312316 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20312316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27184640).

20312316 is an abundant number, since it is smaller than the sum of its proper divisors (34056964).

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

20312316 is a wasteful number, since it uses less digits than its factorization.

20312316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6111 (or 6103 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 20312316 is about 4506.9186813165. The cubic root of 20312316 is about 272.8473969011.

Adding to 20312316 its reverse (61321302), we get a palindrome (81633618).

The spelling of 20312316 in words is "twenty million, three hundred twelve thousand, three hundred sixteen".