20898689 has 8 divisors (see below), whose sum is σ = 25141440. Its totient is φ = 16970256.

The previous prime is 20898677. The next prime is 20898737. The reversal of 20898689 is 98689802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20898689 - 2¹² = 20894593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20898629) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 78434 + ... + 78699.

It is an arithmetic number, because the mean of its divisors is an integer number (3142680).

Almost surely, 2^20898689 is an apocalyptic number.

It is an amenable number.

20898689 is a deficient number, since it is larger than the sum of its proper divisors (4242751).

20898689 is a wasteful number, since it uses less digits than its factorization.

20898689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157159.

The product of its (nonzero) digits is 497664, while the sum is 50.

The square root of 20898689 is about 4571.5083943924. The cubic root of 20898689 is about 275.4480365938.

The spelling of 20898689 in words is "twenty million, eight hundred ninety-eight thousand, six hundred eighty-nine".