20897170 has 32 divisors (see below), whose sum is σ = 43147008. Its totient is φ = 7138368.

The previous prime is 20897147. The next prime is 20897213. The reversal of 20897170 is 7179802.

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, 33784 + ... + 34396.

It is an arithmetic number, because the mean of its divisors is an integer number (1348344).

Almost surely, 2^20897170 is an apocalyptic number.

20897170 is an abundant number, since it is smaller than the sum of its proper divisors (22249838).

20897170 is a wasteful number, since it uses less digits than its factorization.

20897170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 20897170 is about 4571.3422536494. The cubic root of 20897170 is about 275.4413628784.

The spelling of 20897170 in words is "twenty million, eight hundred ninety-seven thousand, one hundred seventy".