20899417 has 16 divisors (see below), whose sum is σ = 26179200. Its totient is φ = 16208640.

The previous prime is 20899379. The next prime is 20899423. The reversal of 20899417 is 71499802.

It is not a de Polignac number, because 20899417 - 2⁷ = 20899289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20899417.

It is not an unprimeable number, because it can be changed into a prime (20899427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20209 + ... + 21217.

It is an arithmetic number, because the mean of its divisors is an integer number (1636200).

Almost surely, 2^20899417 is an apocalyptic number.

It is an amenable number.

20899417 is a deficient number, since it is larger than the sum of its proper divisors (5279783).

20899417 is a wasteful number, since it uses less digits than its factorization.

20899417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 20899417 is about 4571.5880173086. The cubic root of 20899417 is about 275.4512349418.

It can be divided in two parts, 20899 and 417, that added together give a square (21316 = 146²).

The spelling of 20899417 in words is "twenty million, eight hundred ninety-nine thousand, four hundred seventeen".