20373767806789 has 4 divisors (see below), whose sum is σ = 20375430576556. Its totient is φ = 20372105037024.

The previous prime is 20373767806781. The next prime is 20373767806829. The reversal of 20373767806789 is 98760876737302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15169209984289 + 5204557822500 = 3894767^2 + 2281350^2 .

It is a cyclic number.

It is not a de Polignac number, because 20373767806789 - 2³ = 20373767806781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20373767806781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831366504 + ... + 831391009.

It is an arithmetic number, because the mean of its divisors is an integer number (5093857644139).

Almost surely, 2^{20373767806789} is an apocalyptic number.

It is an amenable number.

20373767806789 is a deficient number, since it is larger than the sum of its proper divisors (1662769767).

20373767806789 is a wasteful number, since it uses less digits than its factorization.

20373767806789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662769766.

The product of its (nonzero) digits is 896168448, while the sum is 73.

The spelling of 20373767806789 in words is "twenty trillion, three hundred seventy-three billion, seven hundred sixty-seven million, eight hundred six thousand, seven hundred eighty-nine".