21300620 has 24 divisors (see below), whose sum is σ = 48798288. Its totient is φ = 7745600.

The previous prime is 21300619. The next prime is 21300649. The reversal of 21300620 is 2600312.

It is a junction number, because it is equal to n+sod(n) for n = 21300595 and 21300604.

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, 48191 + ... + 48630.

It is an arithmetic number, because the mean of its divisors is an integer number (2033262).

Almost surely, 2^21300620 is an apocalyptic number.

21300620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21300620 is an abundant number, since it is smaller than the sum of its proper divisors (27497668).

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

21300620 is a wasteful number, since it uses less digits than its factorization.

21300620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96841 (or 96839 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21300620 is about 4615.2594726624. The cubic root of 21300620 is about 277.2026737261.

Adding to 21300620 its reverse (2600312), we get a palindrome (23900932).

The spelling of 21300620 in words is "twenty-one million, three hundred thousand, six hundred twenty".