20000331979 has 2 divisors, whose sum is σ = 20000331980. Its totient is φ = 20000331978.

The previous prime is 20000331941. The next prime is 20000332021. The reversal of 20000331979 is 97913300002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20000331979 - 2¹⁵ = 20000299211 is a prime.

It is not a weakly prime, because it can be changed into another prime (20000331179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000165989 + 10000165990.

It is an arithmetic number, because the mean of its divisors is an integer number (10000165990).

Almost surely, 2^20000331979 is an apocalyptic number.

20000331979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000331979 is an equidigital number, since it uses as much as digits as its factorization.

20000331979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 34.

The spelling of 20000331979 in words is "twenty billion, three hundred thirty-one thousand, nine hundred seventy-nine".