20394749399 has 2 divisors, whose sum is σ = 20394749400. Its totient is φ = 20394749398.

The previous prime is 20394749383. The next prime is 20394749411. The reversal of 20394749399 is 99394749302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20394749399 - 2⁴ = 20394749383 is a prime.

It is a super-2 number, since 2×20394749399² (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 (20394749369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10197374699 + 10197374700.

It is an arithmetic number, because the mean of its divisors is an integer number (10197374700).

Almost surely, 2^20394749399 is an apocalyptic number.

20394749399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20394749399 is an equidigital number, since it uses as much as digits as its factorization.

20394749399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13226976, while the sum is 59.

The spelling of 20394749399 in words is "twenty billion, three hundred ninety-four million, seven hundred forty-nine thousand, three hundred ninety-nine".