20897206 has 16 divisors (see below), whose sum is σ = 34292160. Its totient is φ = 9471880.

The previous prime is 20897147. The next prime is 20897213. The reversal of 20897206 is 60279802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8085 + ... + 10351.

It is an arithmetic number, because the mean of its divisors is an integer number (2143260).

Almost surely, 2^20897206 is an apocalyptic number.

20897206 is a deficient number, since it is larger than the sum of its proper divisors (13394954).

20897206 is a wasteful number, since it uses less digits than its factorization.

20897206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2699.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20897206 is about 4571.3461912220. The cubic root of 20897206 is about 275.4415210479.

The spelling of 20897206 in words is "twenty million, eight hundred ninety-seven thousand, two hundred six".