20456328180 has 24 divisors (see below), whose sum is σ = 57277719072. Its totient is φ = 5455020832.

The previous prime is 20456328163. The next prime is 20456328227. The reversal of 20456328180 is 8182365402.

It is a super-2 number, since 2×20456328180² (a number of 21 digits) contains 22 as substring.

It is a congruent 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, 170469342 + ... + 170469461.

It is an arithmetic number, because the mean of its divisors is an integer number (2386571628).

Almost surely, 2^20456328180 is an apocalyptic number.

20456328180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20456328180 is an abundant number, since it is smaller than the sum of its proper divisors (36821390892).

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

20456328180 is a wasteful number, since it uses less digits than its factorization.

20456328180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340938815 (or 340938813 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The spelling of 20456328180 in words is "twenty billion, four hundred fifty-six million, three hundred twenty-eight thousand, one hundred eighty".