20518780032 has 192 divisors, whose sum is σ = 61447582560. Its totient is φ = 6815508480.

The previous prime is 20518780021. The next prime is 20518780039. The reversal of 20518780032 is 23008781502.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20518780039) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10294428 + ... + 10296420.

Almost surely, 2^20518780032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20518780032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30723791280).

20518780032 is an abundant number, since it is smaller than the sum of its proper divisors (40928802528).

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

20518780032 is an equidigital number, since it uses as much as digits as its factorization.

20518780032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353 (or 2329 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 20518780032 in words is "twenty billion, five hundred eighteen million, seven hundred eighty thousand, thirty-two".