20975910 has 16 divisors (see below), whose sum is σ = 50342256. Its totient is φ = 5593568.

The previous prime is 20975881. The next prime is 20975923. The reversal of 20975910 is 1957902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349569 + ... + 349628.

It is an arithmetic number, because the mean of its divisors is an integer number (3146391).

Almost surely, 2^20975910 is an apocalyptic number.

20975910 is an abundant number, since it is smaller than the sum of its proper divisors (29366346).

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

20975910 is a wasteful number, since it uses less digits than its factorization.

20975910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699207.

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 20975910 is about 4579.9465062378. The cubic root of 20975910 is about 275.7868812673.

The spelling of 20975910 in words is "twenty million, nine hundred seventy-five thousand, nine hundred ten".