21983020 has 48 divisors (see below), whose sum is σ = 47573568. Its totient is φ = 8529920.

The previous prime is 21982973. The next prime is 21983021. The reversal of 21983020 is 2038912.

It is not an unprimeable number, because it can be changed into a prime (21983021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160392 + ... + 160528.

It is an arithmetic number, because the mean of its divisors is an integer number (991116).

Almost surely, 2^21983020 is an apocalyptic number.

21983020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21983020 is an abundant number, since it is smaller than the sum of its proper divisors (25590548).

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

21983020 is a wasteful number, since it uses less digits than its factorization.

21983020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 21983020 is about 4688.6053363447. The cubic root of 21983020 is about 280.1318256810.

The spelling of 21983020 in words is "twenty-one million, nine hundred eighty-three thousand, twenty".