21676480 has 56 divisors (see below), whose sum is σ = 58997088. Its totient is φ = 7431168.

The previous prime is 21676469. The next prime is 21676481. The reversal of 21676480 is 8467612.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21676481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2599 + ... + 7078.

Almost surely, 2^21676480 is an apocalyptic number.

21676480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21676480 is an abundant number, since it is smaller than the sum of its proper divisors (37320608).

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

21676480 is an equidigital number, since it uses as much as digits as its factorization.

21676480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9701 (or 9691 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 21676480 is about 4655.8006830190. The cubic root of 21676480 is about 278.8236360926.

The spelling of 21676480 in words is "twenty-one million, six hundred seventy-six thousand, four hundred eighty".