20868153 has 16 divisors (see below), whose sum is σ = 29223936. Its totient is φ = 13220240.

The previous prime is 20868151. The next prime is 20868157. The reversal of 20868153 is 35186802.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20868153 - 2¹ = 20868151 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20868151) 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, 10618 + ... + 12428.

It is an arithmetic number, because the mean of its divisors is an integer number (1826496).

Almost surely, 2^20868153 is an apocalyptic number.

20868153 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20868153 is a deficient number, since it is larger than the sum of its proper divisors (8355783).

20868153 is a wasteful number, since it uses less digits than its factorization.

20868153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 20868153 is about 4568.1673568292. The cubic root of 20868153 is about 275.3138147585.

The spelling of 20868153 in words is "twenty million, eight hundred sixty-eight thousand, one hundred fifty-three".