20403728718 has 8 divisors (see below), whose sum is σ = 40807457448. Its totient is φ = 6801242904.

The previous prime is 20403728701. The next prime is 20403728753. The reversal of 20403728718 is 81782730402.

It is a sphenic number, since it is the product of 3 distinct primes.

20403728718 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 20403728718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1700310721 + ... + 1700310732.

It is an arithmetic number, because the mean of its divisors is an integer number (5100932181).

Almost surely, 2^20403728718 is an apocalyptic number.

20403728718 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20403728718 is a wasteful number, since it uses less digits than its factorization.

20403728718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3400621458.

The product of its (nonzero) digits is 150528, while the sum is 42.

The spelling of 20403728718 in words is "twenty billion, four hundred three million, seven hundred twenty-eight thousand, seven hundred eighteen".