20349694397 has 2 divisors, whose sum is σ = 20349694398. Its totient is φ = 20349694396.

The previous prime is 20349694373. The next prime is 20349694427. The reversal of 20349694397 is 79349694302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16498374916 + 3851319481 = 128446^2 + 62059^2 .

It is a cyclic number.

It is not a de Polignac number, because 20349694397 - 2²² = 20345500093 is a prime.

It is a super-2 number, since 2×20349694397² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20349694597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10174847198 + 10174847199.

It is an arithmetic number, because the mean of its divisors is an integer number (10174847199).

Almost surely, 2^20349694397 is an apocalyptic number.

It is an amenable number.

20349694397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20349694397 is an equidigital number, since it uses as much as digits as its factorization.

20349694397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8817984, while the sum is 56.

The spelling of 20349694397 in words is "twenty billion, three hundred forty-nine million, six hundred ninety-four thousand, three hundred ninety-seven".