20056288642 has 16 divisors (see below), whose sum is σ = 32566496760. Its totient is φ = 9208783872.

The previous prime is 20056288639. The next prime is 20056288649. The reversal of 20056288642 is 24688265002.

It can be written as a sum of positive squares in 4 ways, for example, as 16261605441 + 3794683201 = 127521^2 + 61601^2 .

It is not an unprimeable number, because it can be changed into a prime (20056288649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1993417 + ... + 2003452.

Almost surely, 2^20056288642 is an apocalyptic number.

20056288642 is a deficient number, since it is larger than the sum of its proper divisors (12510208118).

20056288642 is a wasteful number, since it uses less digits than its factorization.

20056288642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3997077.

The product of its (nonzero) digits is 368640, while the sum is 43.

The spelling of 20056288642 in words is "twenty billion, fifty-six million, two hundred eighty-eight thousand, six hundred forty-two".