20056542156 has 144 divisors (see below), whose sum is σ = 60767616000. Its totient is φ = 5453433216.

The previous prime is 20056542151. The next prime is 20056542203. The reversal of 20056542156 is 65124565002.

20056542156 is a `hidden beast` number, since 2 + 0 + 0 + 565 + 42 + 1 + 56 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20056542156.

It is not an unprimeable number, because it can be changed into a prime (20056542151) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 1144710 + ... + 1162098.

Almost surely, 2^20056542156 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 20056542156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30383808000).

20056542156 is an abundant number, since it is smaller than the sum of its proper divisors (40711073844).

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

20056542156 is a wasteful number, since it uses less digits than its factorization.

20056542156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17628 (or 17623 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 20056542156 in words is "twenty billion, fifty-six million, five hundred forty-two thousand, one hundred fifty-six".