22157920 has 48 divisors (see below), whose sum is σ = 53040960. Its totient is φ = 8745984.

The previous prime is 22157903. The next prime is 22157923. The reversal of 22157920 is 2975122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22157923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11764 + ... + 13516.

It is an arithmetic number, because the mean of its divisors is an integer number (1105020).

Almost surely, 2^22157920 is an apocalyptic number.

22157920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22157920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26520480).

22157920 is an abundant number, since it is smaller than the sum of its proper divisors (30883040).

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

22157920 is a wasteful number, since it uses less digits than its factorization.

22157920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847 (or 1839 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 22157920 is about 4707.2199863614. The cubic root of 22157920 is about 280.8727868172.

The spelling of 22157920 in words is "twenty-two million, one hundred fifty-seven thousand, nine hundred twenty".