20831767388 has 12 divisors (see below), whose sum is σ = 36790048680. Its totient is φ = 10320324912.

The previous prime is 20831767381. The next prime is 20831767393. The reversal of 20831767388 is 88376713802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20831767381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23889206 + ... + 23890077.

It is an arithmetic number, because the mean of its divisors is an integer number (3065837390).

Almost surely, 2^20831767388 is an apocalyptic number.

It is an amenable number.

20831767388 is a deficient number, since it is larger than the sum of its proper divisors (15958281292).

20831767388 is a wasteful number, since it uses less digits than its factorization.

20831767388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47779396 (or 47779394 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 53.

The spelling of 20831767388 in words is "twenty billion, eight hundred thirty-one million, seven hundred sixty-seven thousand, three hundred eighty-eight".