20731392 has 120 divisors (see below), whose sum is σ = 65431080. Its totient is φ = 6266880.

The previous prime is 20731391. The next prime is 20731397. The reversal of 20731392 is 29313702.

It is a super-2 number, since 2×20731392² = 859581228515328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50484 + ... + 50892.

It is an arithmetic number, because the mean of its divisors is an integer number (545259).

Almost surely, 2^20731392 is an apocalyptic number.

20731392 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20731392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32715540).

20731392 is an abundant number, since it is smaller than the sum of its proper divisors (44699688).

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

20731392 is a wasteful number, since it uses less digits than its factorization.

20731392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444 (or 425 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 20731392 is about 4553.1738381046. The cubic root of 20731392 is about 274.7110662297.

The spelling of 20731392 in words is "twenty million, seven hundred thirty-one thousand, three hundred ninety-two".