21846980 has 12 divisors (see below), whose sum is σ = 45878700. Its totient is φ = 8738784.

The previous prime is 21846961. The next prime is 21846991. The reversal of 21846980 is 8964812.

It can be written as a sum of positive squares in 2 ways, for example, as 17172736 + 4674244 = 4144^2 + 2162^2 .

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, 546155 + ... + 546194.

It is an arithmetic number, because the mean of its divisors is an integer number (3823225).

Almost surely, 2^21846980 is an apocalyptic number.

21846980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21846980 is an abundant number, since it is smaller than the sum of its proper divisors (24031720).

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

21846980 is a wasteful number, since it uses less digits than its factorization.

21846980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092358 (or 1092356 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 21846980 is about 4674.0753096201. The cubic root of 21846980 is about 279.5527724446.

The spelling of 21846980 in words is "twenty-one million, eight hundred forty-six thousand, nine hundred eighty".