21968580 has 48 divisors (see below), whose sum is σ = 61778304. Its totient is φ = 5832960.

The previous prime is 21968567. The next prime is 21968603. The reversal of 21968580 is 8586912.

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 15 ways as a sum of consecutive naturals, for example, 16209 + ... + 17511.

It is an arithmetic number, because the mean of its divisors is an integer number (1287048).

Almost surely, 2^21968580 is an apocalyptic number.

21968580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21968580 is an abundant number, since it is smaller than the sum of its proper divisors (39809724).

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

21968580 is a wasteful number, since it uses less digits than its factorization.

21968580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596 (or 1594 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 21968580 is about 4687.0651798327. The cubic root of 21968580 is about 280.0704754573.

The spelling of 21968580 in words is "twenty-one million, nine hundred sixty-eight thousand, five hundred eighty".