20623786388 has 6 divisors (see below), whose sum is σ = 36091626186. Its totient is φ = 10311893192.

The previous prime is 20623786259. The next prime is 20623786451. The reversal of 20623786388 is 88368732602.

It can be written as a sum of positive squares in only one way, i.e., 19332677764 + 1291108624 = 139042^2 + 35932^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2577973295 + ... + 2577973302.

It is an arithmetic number, because the mean of its divisors is an integer number (6015271031).

Almost surely, 2^20623786388 is an apocalyptic number.

It is an amenable number.

20623786388 is a deficient number, since it is larger than the sum of its proper divisors (15467839798).

20623786388 is a wasteful number, since it uses less digits than its factorization.

20623786388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5155946601 (or 5155946599 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 53.

The spelling of 20623786388 in words is "twenty billion, six hundred twenty-three million, seven hundred eighty-six thousand, three hundred eighty-eight".