20975870 has 16 divisors (see below), whose sum is σ = 37890720. Its totient is φ = 8360544.

The previous prime is 20975869. The next prime is 20975879. The reversal of 20975870 is 7857902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20975879) 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, 650 + ... + 6509.

It is an arithmetic number, because the mean of its divisors is an integer number (2368170).

Almost surely, 2^20975870 is an apocalyptic number.

20975870 is a deficient number, since it is larger than the sum of its proper divisors (16914850).

20975870 is a wasteful number, since it uses less digits than its factorization.

20975870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7459.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 20975870 is about 4579.9421393725. The cubic root of 20975870 is about 275.7867059633.

The spelling of 20975870 in words is "twenty million, nine hundred seventy-five thousand, eight hundred seventy".