20995071983 has 2 divisors, whose sum is σ = 20995071984. Its totient is φ = 20995071982.

The previous prime is 20995071967. The next prime is 20995072001. The reversal of 20995071983 is 38917059902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20995071983 - 2⁴ = 20995071967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20995071583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10497535991 + 10497535992.

It is an arithmetic number, because the mean of its divisors is an integer number (10497535992).

Almost surely, 2^20995071983 is an apocalyptic number.

20995071983 is a deficient number, since it is larger than the sum of its proper divisors (1).

20995071983 is an equidigital number, since it uses as much as digits as its factorization.

20995071983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 53.

The spelling of 20995071983 in words is "twenty billion, nine hundred ninety-five million, seventy-one thousand, nine hundred eighty-three".