155190020 has 24 divisors (see below), whose sum is σ = 337138200. Its totient is φ = 59935232.

The previous prime is 155190011. The next prime is 155190031. The reversal of 155190020 is 20091551.

It can be written as a sum of positive squares in 4 ways, for example, as 36772096 + 118417924 = 6064^2 + 10882^2 .

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, 133205 + ... + 134364.

It is an arithmetic number, because the mean of its divisors is an integer number (14047425).

Almost surely, 2^155190020 is an apocalyptic number.

155190020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155190020 is an abundant number, since it is smaller than the sum of its proper divisors (181948180).

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

155190020 is a wasteful number, since it uses less digits than its factorization.

155190020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267607 (or 267605 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 155190020 is about 12457.5286473682. The cubic root of 155190020 is about 537.3879571761.

The spelling of 155190020 in words is "one hundred fifty-five million, one hundred ninety thousand, twenty".