20128472742 has 32 divisors (see below), whose sum is σ = 46946880000. Its totient is φ = 5750991624.

The previous prime is 20128472713. The next prime is 20128472773. The reversal of 20128472742 is 24727482102.

It is a self number, because there is not a number n which added to its sum of digits gives 20128472742.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4888242 + ... + 4892357.

It is an arithmetic number, because the mean of its divisors is an integer number (1467090000).

Almost surely, 2^20128472742 is an apocalyptic number.

20128472742 is an abundant number, since it is smaller than the sum of its proper divisors (26818407258).

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

20128472742 is an equidigital number, since it uses as much as digits as its factorization.

20128472742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9780625 (or 9780611 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 39.

The spelling of 20128472742 in words is "twenty billion, one hundred twenty-eight million, four hundred seventy-two thousand, seven hundred forty-two".