20998159 has 16 divisors (see below), whose sum is σ = 26288640. Its totient is φ = 16328160.

The previous prime is 20998157. The next prime is 20998163. The reversal of 20998159 is 95189902.

It is a cyclic number.

It is not a de Polignac number, because 20998159 - 2¹ = 20998157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20998151) 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, 3414 + ... + 7324.

It is an arithmetic number, because the mean of its divisors is an integer number (1643040).

Almost surely, 2^20998159 is an apocalyptic number.

20998159 is a deficient number, since it is larger than the sum of its proper divisors (5290481).

20998159 is a wasteful number, since it uses less digits than its factorization.

20998159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3990.

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 20998159 is about 4582.3748209853. The cubic root of 20998159 is about 275.8843552130.

The spelling of 20998159 in words is "twenty million, nine hundred ninety-eight thousand, one hundred fifty-nine".