21460620 has 24 divisors (see below), whose sum is σ = 60089904. Its totient is φ = 5722816.

The previous prime is 21460603. The next prime is 21460643. The reversal of 21460620 is 2606412.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178779 + ... + 178898.

It is an arithmetic number, because the mean of its divisors is an integer number (2503746).

Almost surely, 2^21460620 is an apocalyptic number.

21460620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21460620 is an abundant number, since it is smaller than the sum of its proper divisors (38629284).

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

21460620 is a wasteful number, since it uses less digits than its factorization.

21460620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357689 (or 357687 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21460620 is about 4632.5608468751. The cubic root of 21460620 is about 277.8950140985.

The spelling of 21460620 in words is "twenty-one million, four hundred sixty thousand, six hundred twenty".