21880680 has 32 divisors (see below), whose sum is σ = 65642400. Its totient is φ = 5834816.

The previous prime is 21880673. The next prime is 21880697. The reversal of 21880680 is 8608812.

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, 91050 + ... + 91289.

It is an arithmetic number, because the mean of its divisors is an integer number (2051325).

Almost surely, 2^21880680 is an apocalyptic number.

21880680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21880680 is an abundant number, since it is smaller than the sum of its proper divisors (43761720).

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

21880680 is a wasteful number, since it uses less digits than its factorization.

21880680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182353 (or 182349 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 21880680 is about 4677.6789115971. The cubic root of 21880680 is about 279.6964397234.

The spelling of 21880680 in words is "twenty-one million, eight hundred eighty thousand, six hundred eighty".