20975570 has 32 divisors (see below), whose sum is σ = 47074176. Its totient is φ = 6537600.

The previous prime is 20975567. The next prime is 20975587. The reversal of 20975570 is 7557902.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 20975570.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12851 + ... + 14390.

It is an arithmetic number, because the mean of its divisors is an integer number (1471068).

Almost surely, 2^20975570 is an apocalyptic number.

20975570 is an abundant number, since it is smaller than the sum of its proper divisors (26098606).

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

20975570 is a wasteful number, since it uses less digits than its factorization.

20975570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27266.

The product of its (nonzero) digits is 22050, while the sum is 35.

The square root of 20975570 is about 4579.9093877499. The cubic root of 20975570 is about 275.7853911763.

It can be divided in two parts, 2097 and 5570, that added together give a palindrome (7667).

The spelling of 20975570 in words is "twenty million, nine hundred seventy-five thousand, five hundred seventy".