180720920 has 16 divisors (see below), whose sum is σ = 406622160. Its totient is φ = 72288352.

The previous prime is 180720899. The next prime is 180720923. The reversal of 180720920 is 29027081.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180720923) 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, 2258972 + ... + 2259051.

It is an arithmetic number, because the mean of its divisors is an integer number (25413885).

Almost surely, 2^180720920 is an apocalyptic number.

180720920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

180720920 is an abundant number, since it is smaller than the sum of its proper divisors (225901240).

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

180720920 is a wasteful number, since it uses less digits than its factorization.

180720920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4518034 (or 4518030 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 180720920 is about 13443.2481194092. The cubic root of 180720920 is about 565.3744039943.

The spelling of 180720920 in words is "one hundred eighty million, seven hundred twenty thousand, nine hundred twenty".