22457720 has 32 divisors (see below), whose sum is σ = 51228720. Its totient is φ = 8858880.

The previous prime is 22457719. The next prime is 22457749. The reversal of 22457720 is 2775422.

It is a congruent number.

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, 926 + ... + 6765.

Almost surely, 2^22457720 is an apocalyptic number.

22457720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22457720 is an abundant number, since it is smaller than the sum of its proper divisors (28771000).

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

22457720 is a wasteful number, since it uses less digits than its factorization.

22457720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7775 (or 7771 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 29.

The square root of 22457720 is about 4738.9576913072. The cubic root of 22457720 is about 282.1338666610.

The spelling of 22457720 in words is "twenty-two million, four hundred fifty-seven thousand, seven hundred twenty".