20899210 has 16 divisors (see below), whose sum is σ = 38236392. Its totient is φ = 8222400.

The previous prime is 20899201. The next prime is 20899211. The reversal of 20899210 is 1299802.

It can be written as a sum of positive squares in 4 ways, for example, as 17648401 + 3250809 = 4201^2 + 1803^2 .

It is not an unprimeable number, because it can be changed into a prime (20899211) 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, 16521 + ... + 17740.

Almost surely, 2^20899210 is an apocalyptic number.

20899210 is a deficient number, since it is larger than the sum of its proper divisors (17337182).

20899210 is a wasteful number, since it uses less digits than its factorization.

20899210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34329.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 20899210 is about 4571.5653774172. The cubic root of 20899210 is about 275.4503255290.

The spelling of 20899210 in words is "twenty million, eight hundred ninety-nine thousand, two hundred ten".