20110155 has 24 divisors (see below), whose sum is σ = 34846128. Its totient is φ = 9899136.

The previous prime is 20110141. The next prime is 20110169. The reversal of 20110155 is 55101102.

It is an interprime number because it is at equal distance from previous prime (20110141) and next prime (20110169).

It is not a de Polignac number, because 20110155 - 2¹⁷ = 19979083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1432 + ... + 6501.

It is an arithmetic number, because the mean of its divisors is an integer number (1451922).

Almost surely, 2^20110155 is an apocalyptic number.

20110155 is a deficient number, since it is larger than the sum of its proper divisors (14735973).

20110155 is a wasteful number, since it uses less digits than its factorization.

20110155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7967 (or 7954 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 20110155 is about 4484.4347469887. The cubic root of 20110155 is about 271.9391939841.

Adding to 20110155 its reverse (55101102), we get a palindrome (75211257).

The spelling of 20110155 in words is "twenty million, one hundred ten thousand, one hundred fifty-five".