21932680 has 64 divisors (see below), whose sum is σ = 61534080. Its totient is φ = 6835200.

The previous prime is 21932657. The next prime is 21932689. The reversal of 21932680 is 8623912.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21932689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 481 + ... + 6640.

It is an arithmetic number, because the mean of its divisors is an integer number (961470).

Almost surely, 2^21932680 is an apocalyptic number.

21932680 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 21932680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30767040).

21932680 is an abundant number, since it is smaller than the sum of its proper divisors (39601400).

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

21932680 is a wasteful number, since it uses less digits than its factorization.

21932680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7150 (or 7146 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 21932680 is about 4683.2339253981. The cubic root of 21932680 is about 279.9178330330.

The spelling of 21932680 in words is "twenty-one million, nine hundred thirty-two thousand, six hundred eighty".