20981041 has 2 divisors, whose sum is σ = 20981042. Its totient is φ = 20981040.

The previous prime is 20981029. The next prime is 20981047. The reversal of 20981041 is 14018902.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13905441 + 7075600 = 3729^2 + 2660^2 .

It is a cyclic number.

It is not a de Polignac number, because 20981041 - 2⁷ = 20980913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20980997 and 20981015.

It is not a weakly prime, because it can be changed into another prime (20981047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10490520 + 10490521.

It is an arithmetic number, because the mean of its divisors is an integer number (10490521).

Almost surely, 2^20981041 is an apocalyptic number.

It is an amenable number.

20981041 is a deficient number, since it is larger than the sum of its proper divisors (1).

20981041 is an equidigital number, since it uses as much as digits as its factorization.

20981041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 20981041 is about 4580.5066313673. The cubic root of 20981041 is about 275.8093665393.

Adding to 20981041 its reverse (14018902), we get a palindrome (34999943).

The spelling of 20981041 in words is "twenty million, nine hundred eighty-one thousand, forty-one".