20413331 has 2 divisors, whose sum is σ = 20413332. Its totient is φ = 20413330.

The previous prime is 20413291. The next prime is 20413357. The reversal of 20413331 is 13331402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20413331 is a prime.

It is a super-2 number, since 2×20413331² = 833408165031122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20413231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10206665 + 10206666.

It is an arithmetic number, because the mean of its divisors is an integer number (10206666).

Almost surely, 2^20413331 is an apocalyptic number.

20413331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20413331 is an equidigital number, since it uses as much as digits as its factorization.

20413331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 20413331 is about 4518.1114417420. Note that the first 3 decimals coincide. The cubic root of 20413331 is about 273.2989475218.

Adding to 20413331 its reverse (13331402), we get a palindrome (33744733).

The spelling of 20413331 in words is "twenty million, four hundred thirteen thousand, three hundred thirty-one".