20017155 has 8 divisors (see below), whose sum is σ = 32027472. Its totient is φ = 10675808.

The previous prime is 20017147. The next prime is 20017169. The reversal of 20017155 is 55171002.

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 20017155 - 2³ = 20017147 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 667224 + ... + 667253.

It is an arithmetic number, because the mean of its divisors is an integer number (4003434).

Almost surely, 2^20017155 is an apocalyptic number.

20017155 is a deficient number, since it is larger than the sum of its proper divisors (12010317).

20017155 is a wasteful number, since it uses less digits than its factorization.

20017155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334485.

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 20017155 is about 4474.0535311952. The cubic root of 20017155 is about 271.5193492038.

Adding to 20017155 its reverse (55171002), we get a palindrome (75188157).

The spelling of 20017155 in words is "twenty million, seventeen thousand, one hundred fifty-five".