20739898369 has 2 divisors, whose sum is σ = 20739898370. Its totient is φ = 20739898368.

The previous prime is 20739898367. The next prime is 20739898379. The reversal of 20739898369 is 96389893702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20739456144 + 442225 = 144012^2 + 665^2 .

It is a cyclic number.

It is not a de Polignac number, because 20739898369 - 2¹ = 20739898367 is a prime.

It is a super-2 number, since 2×20739898369² (a number of 21 digits) contains 22 as substring.

Together with 20739898367, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20739898369.

It is not a weakly prime, because it can be changed into another prime (20739898363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10369949184 + 10369949185.

It is an arithmetic number, because the mean of its divisors is an integer number (10369949185).

Almost surely, 2^20739898369 is an apocalyptic number.

It is an amenable number.

20739898369 is a deficient number, since it is larger than the sum of its proper divisors (1).

20739898369 is an equidigital number, since it uses as much as digits as its factorization.

20739898369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35271936, while the sum is 64.

The spelling of 20739898369 in words is "twenty billion, seven hundred thirty-nine million, eight hundred ninety-eight thousand, three hundred sixty-nine".