20328715880 has 128 divisors (see below), whose sum is σ = 50723625600. Its totient is φ = 7270502400.

The previous prime is 20328715879. The next prime is 20328715909. The reversal of 20328715880 is 8851782302.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15770276 + ... + 15771564.

It is an arithmetic number, because the mean of its divisors is an integer number (396278325).

Almost surely, 2^20328715880 is an apocalyptic number.

20328715880 is a gapful number since it is divisible by the number (20) 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 20328715880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25361812800).

20328715880 is an abundant number, since it is smaller than the sum of its proper divisors (30394909720).

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

20328715880 is a wasteful number, since it uses less digits than its factorization.

20328715880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875 (or 1871 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 20328715880 in words is "twenty billion, three hundred twenty-eight million, seven hundred fifteen thousand, eight hundred eighty".