20997792 has 60 divisors (see below), whose sum is σ = 61761546. Its totient is φ = 6998400.

The previous prime is 20997761. The next prime is 20997829. The reversal of 20997792 is 29779902.

It can be written as a sum of positive squares in only one way, i.e., 10732176 + 10265616 = 3276^2 + 3204^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1459 + ... + 6642.

Almost surely, 2^20997792 is an apocalyptic number.

It is an amenable number.

20997792 is an abundant number, since it is smaller than the sum of its proper divisors (40763754).

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

20997792 is an equidigital number, since it uses as much as digits as its factorization.

20997792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8123 (or 8106 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 20997792 is about 4582.3347760721. The cubic root of 20997792 is about 275.8827479269.

The spelling of 20997792 in words is "twenty million, nine hundred ninety-seven thousand, seven hundred ninety-two".