20155105 has 16 divisors (see below), whose sum is σ = 25945920. Its totient is φ = 14983488.

The previous prime is 20155097. The next prime is 20155117. The reversal of 20155105 is 50155102.

It is a cyclic number.

It is not a de Polignac number, because 20155105 - 2³ = 20155097 is a prime.

It is a super-2 number, since 2×20155105² = 812456515122050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3034 + ... + 7036.

It is an arithmetic number, because the mean of its divisors is an integer number (1621620).

Almost surely, 2^20155105 is an apocalyptic number.

It is an amenable number.

20155105 is a deficient number, since it is larger than the sum of its proper divisors (5790815).

20155105 is a wasteful number, since it uses less digits than its factorization.

20155105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4080.

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 20155105 is about 4489.4437294614. The cubic root of 20155105 is about 272.1416550568.

The spelling of 20155105 in words is "twenty million, one hundred fifty-five thousand, one hundred five".