21882580 has 12 divisors (see below), whose sum is σ = 45953460. Its totient is φ = 8753024.

The previous prime is 21882557. The next prime is 21882593. The reversal of 21882580 is 8528812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10471696 + 11410884 = 3236^2 + 3378^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 547045 + ... + 547084.

It is an arithmetic number, because the mean of its divisors is an integer number (3829455).

Almost surely, 2^21882580 is an apocalyptic number.

21882580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21882580 is an abundant number, since it is smaller than the sum of its proper divisors (24070880).

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

21882580 is a wasteful number, since it uses less digits than its factorization.

21882580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094138 (or 1094136 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 21882580 is about 4677.8819993668. The cubic root of 21882580 is about 279.7045352648.

The spelling of 21882580 in words is "twenty-one million, eight hundred eighty-two thousand, five hundred eighty".