20679843738 has 16 divisors (see below), whose sum is σ = 41361166080. Its totient is φ = 6893034816.

The previous prime is 20679843731. The next prime is 20679843761. The reversal of 20679843738 is 83734897602.

It is not an unprimeable number, because it can be changed into a prime (20679843731) 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 7 ways as a sum of consecutive naturals, for example, 217431 + ... + 297717.

It is an arithmetic number, because the mean of its divisors is an integer number (2585072880).

Almost surely, 2^20679843738 is an apocalyptic number.

20679843738 is an abundant number, since it is smaller than the sum of its proper divisors (20681322342).

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

20679843738 is a wasteful number, since it uses less digits than its factorization.

20679843738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123221.

The product of its (nonzero) digits is 12192768, while the sum is 57.

The spelling of 20679843738 in words is "twenty billion, six hundred seventy-nine million, eight hundred forty-three thousand, seven hundred thirty-eight".