20083981 has 2 divisors, whose sum is σ = 20083982. Its totient is φ = 20083980.

The previous prime is 20083961. The next prime is 20084011. The reversal of 20083981 is 18938002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15093225 + 4990756 = 3885^2 + 2234^2 .

It is a cyclic number.

It is not a de Polignac number, because 20083981 - 2⁵ = 20083949 is a prime.

It is a super-2 number, since 2×20083981² = 806732585616722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20083961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10041990 + 10041991.

It is an arithmetic number, because the mean of its divisors is an integer number (10041991).

Almost surely, 2^20083981 is an apocalyptic number.

It is an amenable number.

20083981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20083981 is an equidigital number, since it uses as much as digits as its factorization.

20083981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 20083981 is about 4481.5154802812. The cubic root of 20083981 is about 271.8211636211.

The spelling of 20083981 in words is "twenty million, eighty-three thousand, nine hundred eighty-one".