20647798278 has 16 divisors (see below), whose sum is σ = 41674456560. Its totient is φ = 6819456096.

The previous prime is 20647798261. The next prime is 20647798289. The reversal of 20647798278 is 87289774602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15785125 + ... + 15786432.

It is an arithmetic number, because the mean of its divisors is an integer number (2604653535).

Almost surely, 2^20647798278 is an apocalyptic number.

20647798278 is an abundant number, since it is smaller than the sum of its proper divisors (21026658282).

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

20647798278 is a wasteful number, since it uses less digits than its factorization.

20647798278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31571671.

The product of its (nonzero) digits is 18966528, while the sum is 60.

The spelling of 20647798278 in words is "twenty billion, six hundred forty-seven million, seven hundred ninety-eight thousand, two hundred seventy-eight".