21794980 has 24 divisors (see below), whose sum is σ = 46835712. Its totient is φ = 8514912.

The previous prime is 21794977. The next prime is 21794987. The reversal of 21794980 is 8949712.

It is not an unprimeable number, because it can be changed into a prime (21794987) 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, 11812 + ... + 13531.

It is an arithmetic number, because the mean of its divisors is an integer number (1951488).

Almost surely, 2^21794980 is an apocalyptic number.

21794980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21794980 is an abundant number, since it is smaller than the sum of its proper divisors (25040732).

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

21794980 is a wasteful number, since it uses less digits than its factorization.

21794980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25395 (or 25393 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 21794980 is about 4668.5093980841. The cubic root of 21794980 is about 279.3307998446.

The spelling of 21794980 in words is "twenty-one million, seven hundred ninety-four thousand, nine hundred eighty".