21076920 has 96 divisors (see below), whose sum is σ = 69189120. Its totient is φ = 5564160.

The previous prime is 21076883. The next prime is 21076921. The reversal of 21076920 is 2967012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21076921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45490 + ... + 45950.

It is an arithmetic number, because the mean of its divisors is an integer number (720720).

Almost surely, 2^21076920 is an apocalyptic number.

21076920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21076920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34594560).

21076920 is an abundant number, since it is smaller than the sum of its proper divisors (48112200).

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

21076920 is a wasteful number, since it uses less digits than its factorization.

21076920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605 (or 598 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 21076920 is about 4590.9606837785. The cubic root of 21076920 is about 276.2288586976.

The spelling of 21076920 in words is "twenty-one million, seventy-six thousand, nine hundred twenty".