20813033 has 2 divisors, whose sum is σ = 20813034. Its totient is φ = 20813032.

The previous prime is 20813021. The next prime is 20813041. The reversal of 20813033 is 33031802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20502784 + 310249 = 4528^2 + 557^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20813033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20812996 and 20813014.

It is not a weakly prime, because it can be changed into another prime (20813003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10406516 + 10406517.

It is an arithmetic number, because the mean of its divisors is an integer number (10406517).

Almost surely, 2^20813033 is an apocalyptic number.

It is an amenable number.

20813033 is a deficient number, since it is larger than the sum of its proper divisors (1).

20813033 is an equidigital number, since it uses as much as digits as its factorization.

20813033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20813033 is about 4562.1303137898. The cubic root of 20813033 is about 275.0712013981.

Adding to 20813033 its reverse (33031802), we get a palindrome (53844835).

The spelling of 20813033 in words is "twenty million, eight hundred thirteen thousand, thirty-three".