20343031979 has 2 divisors, whose sum is σ = 20343031980. Its totient is φ = 20343031978.

The previous prime is 20343031937. The next prime is 20343032053. The reversal of 20343031979 is 97913034302.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20343031979 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20343036979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10171515989 + 10171515990.

It is an arithmetic number, because the mean of its divisors is an integer number (10171515990).

Almost surely, 2^20343031979 is an apocalyptic number.

20343031979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20343031979 is an equidigital number, since it uses as much as digits as its factorization.

20343031979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 41.

The spelling of 20343031979 in words is "twenty billion, three hundred forty-three million, thirty-one thousand, nine hundred seventy-nine".