20720392 has 32 divisors (see below), whose sum is σ = 48438720. Its totient is φ = 8072640.

The previous prime is 20720363. The next prime is 20720417. The reversal of 20720392 is 29302702.

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, 16203 + ... + 17434.

It is an arithmetic number, because the mean of its divisors is an integer number (1513710).

Almost surely, 2^20720392 is an apocalyptic number.

20720392 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20720392 is an abundant number, since it is smaller than the sum of its proper divisors (27718328).

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

20720392 is a wasteful number, since it uses less digits than its factorization.

20720392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33661 (or 33657 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 20720392 is about 4551.9657292207. The cubic root of 20720392 is about 274.6624707416.

It can be divided in two parts, 20720 and 392, that added together give a palindrome (21112).

The spelling of 20720392 in words is "twenty million, seven hundred twenty thousand, three hundred ninety-two".