21932460 has 216 divisors, whose sum is σ = 78427440. Its totient is φ = 4942080.

The previous prime is 21932459. The next prime is 21932473. The reversal of 21932460 is 6423912.

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 71 ways as a sum of consecutive naturals, for example, 413794 + ... + 413846.

It is an arithmetic number, because the mean of its divisors is an integer number (363090).

Almost surely, 2^21932460 is an apocalyptic number.

21932460 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 21932460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39213720).

21932460 is an abundant number, since it is smaller than the sum of its proper divisors (56494980).

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

21932460 is a wasteful number, since it uses less digits than its factorization.

21932460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 21932460 is about 4683.2104372962. The cubic root of 21932460 is about 279.9168971065.

The spelling of 21932460 in words is "twenty-one million, nine hundred thirty-two thousand, four hundred sixty".