21963980 has 24 divisors (see below), whose sum is σ = 46252080. Its totient is φ = 8761280.

The previous prime is 21963971. The next prime is 21964003. The reversal of 21963980 is 8936912.

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, 7070 + ... + 9690.

It is an arithmetic number, because the mean of its divisors is an integer number (1927170).

Almost surely, 2^21963980 is an apocalyptic number.

21963980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21963980 is an abundant number, since it is smaller than the sum of its proper divisors (24288100).

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

21963980 is a wasteful number, since it uses less digits than its factorization.

21963980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3049 (or 3047 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 21963980 is about 4686.5744419565. The cubic root of 21963980 is about 280.0509261112.

The spelling of 21963980 in words is "twenty-one million, nine hundred sixty-three thousand, nine hundred eighty".