20899570 has 16 divisors (see below), whose sum is σ = 38257920. Its totient is φ = 8217904.

The previous prime is 20899559. The next prime is 20899573. The reversal of 20899570 is 7599802.

It is not an unprimeable number, because it can be changed into a prime (20899573) 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, 17122 + ... + 18301.

It is an arithmetic number, because the mean of its divisors is an integer number (2391120).

Almost surely, 2^20899570 is an apocalyptic number.

20899570 is a deficient number, since it is larger than the sum of its proper divisors (17358350).

20899570 is a wasteful number, since it uses less digits than its factorization.

20899570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35489.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 20899570 is about 4571.6047510694. The cubic root of 20899570 is about 275.4519071126.

The spelling of 20899570 in words is "twenty million, eight hundred ninety-nine thousand, five hundred seventy".