22981520 has 20 divisors (see below), whose sum is σ = 53432220. Its totient is φ = 9192576.

The previous prime is 22981513. The next prime is 22981547. The reversal of 22981520 is 2518922.

It can be written as a sum of positive squares in 2 ways, for example, as 6885376 + 16096144 = 2624^2 + 4012^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143555 + ... + 143714.

It is an arithmetic number, because the mean of its divisors is an integer number (2671611).

Almost surely, 2^22981520 is an apocalyptic number.

22981520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22981520 is an abundant number, since it is smaller than the sum of its proper divisors (30450700).

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

22981520 is a wasteful number, since it uses less digits than its factorization.

22981520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287282 (or 287276 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 22981520 is about 4793.9044629613. The cubic root of 22981520 is about 284.3105114003.

The spelling of 22981520 in words is "twenty-two million, nine hundred eighty-one thousand, five hundred twenty".