22645520 has 80 divisors (see below), whose sum is σ = 55978560. Its totient is φ = 8504832.

The previous prime is 22645507. The next prime is 22645541. The reversal of 22645520 is 2554622.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 22645520.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99647 + ... + 99873.

It is an arithmetic number, because the mean of its divisors is an integer number (699732).

Almost surely, 2^22645520 is an apocalyptic number.

22645520 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 22645520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27989280).

22645520 is an abundant number, since it is smaller than the sum of its proper divisors (33333040).

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

22645520 is a wasteful number, since it uses less digits than its factorization.

22645520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 22645520 is about 4758.7309232609. The cubic root of 22645520 is about 282.9181215430.

The spelling of 22645520 in words is "twenty-two million, six hundred forty-five thousand, five hundred twenty".