123155020 has 12 divisors (see below), whose sum is σ = 258625584. Its totient is φ = 49262000.

The previous prime is 123155009. The next prime is 123155029. The reversal of 123155020 is 20551321.

It is not an unprimeable number, because it can be changed into a prime (123155029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3078856 + ... + 3078895.

It is an arithmetic number, because the mean of its divisors is an integer number (21552132).

Almost surely, 2^123155020 is an apocalyptic number.

123155020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123155020 is an abundant number, since it is smaller than the sum of its proper divisors (135470564).

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

123155020 is a wasteful number, since it uses less digits than its factorization.

123155020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6157760 (or 6157758 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 123155020 is about 11097.5231470811. The cubic root of 123155020 is about 497.5278234988.

The spelling of 123155020 in words is "one hundred twenty-three million, one hundred fifty-five thousand, twenty".