20720922 has 16 divisors (see below), whose sum is σ = 41845440. Its totient is φ = 6839712.

The previous prime is 20720911. The next prime is 20720951. The reversal of 20720922 is 22902702.

It is a junction number, because it is equal to n+sod(n) for n = 20720892 and 20720901.

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, 16147 + ... + 17382.

It is an arithmetic number, because the mean of its divisors is an integer number (2615340).

Almost surely, 2^20720922 is an apocalyptic number.

20720922 is an abundant number, since it is smaller than the sum of its proper divisors (21124518).

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

20720922 is a wasteful number, since it uses less digits than its factorization.

20720922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33637.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20720922 is about 4552.0239454555. The cubic root of 20720922 is about 274.6648125549.

The spelling of 20720922 in words is "twenty million, seven hundred twenty thousand, nine hundred twenty-two".