21676580 has 24 divisors (see below), whose sum is σ = 47500992. Its totient is φ = 8293472.

The previous prime is 21676579. The next prime is 21676607. The reversal of 21676580 is 8567612.

It is a self number, because there is not a number n which added to its sum of digits gives 21676580.

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, 23102 + ... + 24021.

It is an arithmetic number, because the mean of its divisors is an integer number (1979208).

Almost surely, 2^21676580 is an apocalyptic number.

21676580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21676580 is an abundant number, since it is smaller than the sum of its proper divisors (25824412).

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

21676580 is a wasteful number, since it uses less digits than its factorization.

21676580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47155 (or 47153 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 21676580 is about 4655.8114222979. The cubic root of 21676580 is about 278.8240648572.

The spelling of 21676580 in words is "twenty-one million, six hundred seventy-six thousand, five hundred eighty".