204120155 has 8 divisors (see below), whose sum is σ = 247234032. Its totient is φ = 161769568.

The previous prime is 204120143. The next prime is 204120167. The reversal of 204120155 is 551021402.

It is an interprime number because it is at equal distance from previous prime (204120143) and next prime (204120167).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204120155 is a prime.

It is a Duffinian number.

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, 190232 + ... + 191301.

It is an arithmetic number, because the mean of its divisors is an integer number (30904254).

Almost surely, 2^204120155 is an apocalyptic number.

204120155 is a deficient number, since it is larger than the sum of its proper divisors (43113877).

204120155 is a wasteful number, since it uses less digits than its factorization.

204120155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381645.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 204120155 is about 14287.0625042379. The cubic root of 204120155 is about 588.7920848684.

Adding to 204120155 its reverse (551021402), we get a palindrome (755141557).

The spelling of 204120155 in words is "two hundred four million, one hundred twenty thousand, one hundred fifty-five".