22057720 has 16 divisors (see below), whose sum is σ = 49629960. Its totient is φ = 8823072.

The previous prime is 22057697. The next prime is 22057723. The reversal of 22057720 is 2775022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22057723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275682 + ... + 275761.

Almost surely, 2^22057720 is an apocalyptic number.

22057720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22057720 is an abundant number, since it is smaller than the sum of its proper divisors (27572240).

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

22057720 is a wasteful number, since it uses less digits than its factorization.

22057720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551454 (or 551450 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 22057720 is about 4696.5647019923. The cubic root of 22057720 is about 280.4487701451.

The spelling of 22057720 in words is "twenty-two million, fifty-seven thousand, seven hundred twenty".