20679843739 has 8 divisors (see below), whose sum is σ = 20714801328. Its totient is φ = 20644911840.

The previous prime is 20679843731. The next prime is 20679843761. The reversal of 20679843739 is 93734897602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20679843739 - 2³ = 20679843731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20679843731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2209209 + ... + 2218549.

It is an arithmetic number, because the mean of its divisors is an integer number (2589350166).

Almost surely, 2^20679843739 is an apocalyptic number.

20679843739 is a deficient number, since it is larger than the sum of its proper divisors (34957589).

20679843739 is an equidigital number, since it uses as much as digits as its factorization.

20679843739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12845.

The product of its (nonzero) digits is 13716864, while the sum is 58.

The spelling of 20679843739 in words is "twenty billion, six hundred seventy-nine million, eight hundred forty-three thousand, seven hundred thirty-nine".