20778590394 has 32 divisors (see below), whose sum is σ = 46204755840. Its totient is φ = 6921680256.

The previous prime is 20778590389. The next prime is 20778590401. The reversal of 20778590394 is 49309587702.

20778590394 is a `hidden beast` number, since 20 + 77 + 85 + 90 + 394 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 20778590394.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41367 + ... + 208010.

It is an arithmetic number, because the mean of its divisors is an integer number (1443898620).

Almost surely, 2^20778590394 is an apocalyptic number.

20778590394 is an abundant number, since it is smaller than the sum of its proper divisors (25426165446).

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

20778590394 is a wasteful number, since it uses less digits than its factorization.

20778590394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250931 (or 250925 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The spelling of 20778590394 in words is "twenty billion, seven hundred seventy-eight million, five hundred ninety thousand, three hundred ninety-four".