20050981 has 2 divisors, whose sum is σ = 20050982. Its totient is φ = 20050980.

The previous prime is 20050969. The next prime is 20051047. The reversal of 20050981 is 18905002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19660356 + 390625 = 4434^2 + 625^2 .

It is a cyclic number.

It is not a de Polignac number, because 20050981 - 2⁷ = 20050853 is a prime.

It is a super-3 number, since 3×20050981³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20050951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10025490 + 10025491.

It is an arithmetic number, because the mean of its divisors is an integer number (10025491).

Almost surely, 2^20050981 is an apocalyptic number.

It is an amenable number.

20050981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20050981 is an equidigital number, since it uses as much as digits as its factorization.

20050981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 20050981 is about 4477.8321763996. The cubic root of 20050981 is about 271.6722055068.

Adding to 20050981 its reverse (18905002), we get a palindrome (38955983).

The spelling of 20050981 in words is "twenty million, fifty thousand, nine hundred eighty-one".