21462920 has 32 divisors (see below), whose sum is σ = 48539520. Its totient is φ = 8541120.

The previous prime is 21462919. The next prime is 21462941. The reversal of 21462920 is 2926412.

It is a self number, because there is not a number n which added to its sum of digits gives 21462920.

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, 7169 + ... + 9711.

It is an arithmetic number, because the mean of its divisors is an integer number (1516860).

Almost surely, 2^21462920 is an apocalyptic number.

21462920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21462920 is an abundant number, since it is smaller than the sum of its proper divisors (27076600).

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

21462920 is a wasteful number, since it uses less digits than its factorization.

21462920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2765 (or 2761 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 21462920 is about 4632.8090830510. The cubic root of 21462920 is about 277.9049413622.

The spelling of 21462920 in words is "twenty-one million, four hundred sixty-two thousand, nine hundred twenty".