22163720 has 32 divisors (see below), whose sum is σ = 52038720. Its totient is φ = 8479680.

The previous prime is 22163693. The next prime is 22163731. The reversal of 22163720 is 2736122.

It is a Harshad number since it is a multiple of its sum of digits (23).

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, 11126 + ... + 12965.

It is an arithmetic number, because the mean of its divisors is an integer number (1626210).

Almost surely, 2^22163720 is an apocalyptic number.

22163720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22163720 is an abundant number, since it is smaller than the sum of its proper divisors (29875000).

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

22163720 is a wasteful number, since it uses less digits than its factorization.

22163720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24125 (or 24121 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 22163720 is about 4707.8360209336. The cubic root of 22163720 is about 280.8972915247.

Adding to 22163720 its reverse (2736122), we get a palindrome (24899842).

The spelling of 22163720 in words is "twenty-two million, one hundred sixty-three thousand, seven hundred twenty".