21876980 has 24 divisors (see below), whose sum is σ = 48360480. Its totient is φ = 8290080.

The previous prime is 21876973. The next prime is 21876983. The reversal of 21876980 is 8967812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21876983) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 28406 + ... + 29165.

It is an arithmetic number, because the mean of its divisors is an integer number (2015020).

Almost surely, 2^21876980 is an apocalyptic number.

21876980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21876980 is an abundant number, since it is smaller than the sum of its proper divisors (26483500).

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

21876980 is a wasteful number, since it uses less digits than its factorization.

21876980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57599 (or 57597 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 21876980 is about 4677.2833995814. The cubic root of 21876980 is about 279.6806733766.

The spelling of 21876980 in words is "twenty-one million, eight hundred seventy-six thousand, nine hundred eighty".