20431009979 has 2 divisors, whose sum is σ = 20431009980. Its totient is φ = 20431009978.

The previous prime is 20431009967. The next prime is 20431009999. The reversal of 20431009979 is 97990013402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20431009979 - 2³² = 16136042683 is a prime.

It is not a weakly prime, because it can be changed into another prime (20431009999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215504989 + 10215504990.

It is an arithmetic number, because the mean of its divisors is an integer number (10215504990).

Almost surely, 2^20431009979 is an apocalyptic number.

20431009979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431009979 is an equidigital number, since it uses as much as digits as its factorization.

20431009979 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 44.

The spelling of 20431009979 in words is "twenty billion, four hundred thirty-one million, nine thousand, nine hundred seventy-nine".