20201001979 has 2 divisors, whose sum is σ = 20201001980. Its totient is φ = 20201001978.

The previous prime is 20201001971. The next prime is 20201001983. The reversal of 20201001979 is 97910010202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20201001979 - 2³ = 20201001971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20201001979.

It is not a weakly prime, because it can be changed into another prime (20201001971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100500989 + 10100500990.

It is an arithmetic number, because the mean of its divisors is an integer number (10100500990).

Almost surely, 2^20201001979 is an apocalyptic number.

20201001979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201001979 is an equidigital number, since it uses as much as digits as its factorization.

20201001979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

The spelling of 20201001979 in words is "twenty billion, two hundred one million, one thousand, nine hundred seventy-nine".