21795760 has 40 divisors (see below), whose sum is σ = 57915936. Its totient is φ = 7472640.

The previous prime is 21795757. The next prime is 21795817. The reversal of 21795760 is 6759712.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a nontrivial repunit in base 279.

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 7 ways as a sum of consecutive naturals, for example, 18901 + ... + 20020.

Almost surely, 2^21795760 is an apocalyptic number.

21795760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21795760 is an abundant number, since it is smaller than the sum of its proper divisors (36120176).

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

21795760 is a wasteful number, since it uses less digits than its factorization.

21795760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38941 (or 38935 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 21795760 is about 4668.5929357784. The cubic root of 21795760 is about 279.3341320405.

The spelling of 21795760 in words is "twenty-one million, seven hundred ninety-five thousand, seven hundred sixty".