20989417 has 16 divisors (see below), whose sum is σ = 22579200. Its totient is φ = 19474560.

The previous prime is 20989393. The next prime is 20989421. The reversal of 20989417 is 71498902.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20989417 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 20989417.

It is not an unprimeable number, because it can be changed into a prime (20989457) 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, 150934 + ... + 151072.

It is an arithmetic number, because the mean of its divisors is an integer number (1411200).

Almost surely, 2^20989417 is an apocalyptic number.

It is an amenable number.

20989417 is a deficient number, since it is larger than the sum of its proper divisors (1589783).

20989417 is a wasteful number, since it uses less digits than its factorization.

20989417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336.

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

The square root of 20989417 is about 4581.4208494745. The cubic root of 20989417 is about 275.8460643037.

The spelling of 20989417 in words is "twenty million, nine hundred eighty-nine thousand, four hundred seventeen".