21874720 has 48 divisors (see below), whose sum is σ = 59064768. Its totient is φ = 7499520.

The previous prime is 21874711. The next prime is 21874751. The reversal of 21874720 is 2747812.

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, 8646 + ... + 10885.

It is an arithmetic number, because the mean of its divisors is an integer number (1230516).

Almost surely, 2^21874720 is an apocalyptic number.

21874720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21874720 is an abundant number, since it is smaller than the sum of its proper divisors (37190048).

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

21874720 is a wasteful number, since it uses less digits than its factorization.

21874720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19553 (or 19545 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 21874720 is about 4677.0418001125. The cubic root of 21874720 is about 279.6710422471.

The spelling of 21874720 in words is "twenty-one million, eight hundred seventy-four thousand, seven hundred twenty".