20618041 has 2 divisors, whose sum is σ = 20618042. Its totient is φ = 20618040.

The previous prime is 20618023. The next prime is 20618057. The reversal of 20618041 is 14081602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11594025 + 9024016 = 3405^2 + 3004^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20618041 is a prime.

It is a super-2 number, since 2×20618041² = 850207229355362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20618011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10309020 + 10309021.

It is an arithmetic number, because the mean of its divisors is an integer number (10309021).

Almost surely, 2^20618041 is an apocalyptic number.

It is an amenable number.

20618041 is a deficient number, since it is larger than the sum of its proper divisors (1).

20618041 is an equidigital number, since it uses as much as digits as its factorization.

20618041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 20618041 is about 4540.7093058244. The cubic root of 20618041 is about 274.2094807025.

Adding to 20618041 its reverse (14081602), we get a palindrome (34699643).

The spelling of 20618041 in words is "twenty million, six hundred eighteen thousand, forty-one".