20104155 has 12 divisors (see below), whose sum is σ = 34847280. Its totient is φ = 10722192.

The previous prime is 20104153. The next prime is 20104159. The reversal of 20104155 is 55140102.

It is not a de Polignac number, because 20104155 - 2¹ = 20104153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20104153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 223335 + ... + 223424.

It is an arithmetic number, because the mean of its divisors is an integer number (2903940).

Almost surely, 2^20104155 is an apocalyptic number.

20104155 is a deficient number, since it is larger than the sum of its proper divisors (14743125).

20104155 is a wasteful number, since it uses less digits than its factorization.

20104155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446770 (or 446767 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 20104155 is about 4483.7657164486. The cubic root of 20104155 is about 271.9121463315.

Adding to 20104155 its reverse (55140102), we get a palindrome (75244257).

The spelling of 20104155 in words is "twenty million, one hundred four thousand, one hundred fifty-five".