20216816839 has 2 divisors, whose sum is σ = 20216816840. Its totient is φ = 20216816838.

The previous prime is 20216816831. The next prime is 20216816861. The reversal of 20216816839 is 93861861202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20216816839 - 2³ = 20216816831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20216816831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10108408419 + 10108408420.

It is an arithmetic number, because the mean of its divisors is an integer number (10108408420).

Almost surely, 2^20216816839 is an apocalyptic number.

20216816839 is a deficient number, since it is larger than the sum of its proper divisors (1).

20216816839 is an equidigital number, since it uses as much as digits as its factorization.

20216816839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 20216816839 in words is "twenty billion, two hundred sixteen million, eight hundred sixteen thousand, eight hundred thirty-nine".