155205120 has 160 divisors (see below), whose sum is σ = 567249408. Its totient is φ = 35463168.

The previous prime is 155205109. The next prime is 155205133. The reversal of 155205120 is 21502551.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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, 52317 + ... + 55203.

Almost surely, 2^155205120 is an apocalyptic number.

155205120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155205120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283624704).

155205120 is an abundant number, since it is smaller than the sum of its proper divisors (412044288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155205120 is an equidigital number, since it uses as much as digits as its factorization.

155205120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920 (or 2904 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 155205120 is about 12458.1346918389. The cubic root of 155205120 is about 537.4053859064.

Adding to 155205120 its reverse (21502551), we get a palindrome (176707671).

The spelling of 155205120 in words is "one hundred fifty-five million, two hundred five thousand, one hundred twenty".