20772534188 has 48 divisors (see below), whose sum is σ = 43194009600. Its totient is φ = 8553306240.

The previous prime is 20772534179. The next prime is 20772534193. The reversal of 20772534188 is 88143527702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34568 + ... + 206736.

It is an arithmetic number, because the mean of its divisors is an integer number (899875200).

Almost surely, 2^20772534188 is an apocalyptic number.

20772534188 is a gapful number since it is divisible by the number (28) 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 20772534188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21597004800).

20772534188 is an abundant number, since it is smaller than the sum of its proper divisors (22421475412).

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

20772534188 is a wasteful number, since it uses less digits than its factorization.

20772534188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172350 (or 172348 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 47.

The spelling of 20772534188 in words is "twenty billion, seven hundred seventy-two million, five hundred thirty-four thousand, one hundred eighty-eight".