21814620 has 24 divisors (see below), whose sum is σ = 61081104. Its totient is φ = 5817216.

The previous prime is 21814619. The next prime is 21814633. The reversal of 21814620 is 2641812.

It is a congruent number.

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, 181729 + ... + 181848.

It is an arithmetic number, because the mean of its divisors is an integer number (2545046).

Almost surely, 2^21814620 is an apocalyptic number.

21814620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21814620 is an abundant number, since it is smaller than the sum of its proper divisors (39266484).

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

21814620 is a wasteful number, since it uses less digits than its factorization.

21814620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363589 (or 363587 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 21814620 is about 4670.6123795494. The cubic root of 21814620 is about 279.4146786378.

The spelling of 21814620 in words is "twenty-one million, eight hundred fourteen thousand, six hundred twenty".