20731304 has 32 divisors (see below), whose sum is σ = 42897600. Its totient is φ = 9313920.

The previous prime is 20731301. The next prime is 20731307. The reversal of 20731304 is 40313702.

It is an interprime number because it is at equal distance from previous prime (20731301) and next prime (20731307).

It is not an unprimeable number, because it can be changed into a prime (20731301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6509 + ... + 9155.

It is an arithmetic number, because the mean of its divisors is an integer number (1340550).

Almost surely, 2^20731304 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 20731304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21448800).

20731304 is an abundant number, since it is smaller than the sum of its proper divisors (22166296).

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

20731304 is a wasteful number, since it uses less digits than its factorization.

20731304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2753 (or 2749 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 20731304 is about 4553.1641745055. The cubic root of 20731304 is about 274.7106775341.

The spelling of 20731304 in words is "twenty million, seven hundred thirty-one thousand, three hundred four".