20898465 has 16 divisors (see below), whose sum is σ = 38214528. Its totient is φ = 9553536.

The previous prime is 20898443. The next prime is 20898481. The reversal of 20898465 is 56489802.

It is not a de Polignac number, because 20898465 - 2⁶ = 20898401 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99412 + ... + 99621.

It is an arithmetic number, because the mean of its divisors is an integer number (2388408).

Almost surely, 2^20898465 is an apocalyptic number.

It is an amenable number.

20898465 is a deficient number, since it is larger than the sum of its proper divisors (17316063).

20898465 is a wasteful number, since it uses less digits than its factorization.

20898465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199048.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 20898465 is about 4571.4838947545. The cubic root of 20898465 is about 275.4470524717.

The spelling of 20898465 in words is "twenty million, eight hundred ninety-eight thousand, four hundred sixty-five".