20313133 has 2 divisors, whose sum is σ = 20313134. Its totient is φ = 20313132.

The previous prime is 20313121. The next prime is 20313143. The reversal of 20313133 is 33131302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12545764 + 7767369 = 3542^2 + 2787^2 .

It is a cyclic number.

It is not a de Polignac number, because 20313133 - 2¹³ = 20304941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20313143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156566 + 10156567.

It is an arithmetic number, because the mean of its divisors is an integer number (10156567).

Almost surely, 2^20313133 is an apocalyptic number.

It is an amenable number.

20313133 is a deficient number, since it is larger than the sum of its proper divisors (1).

20313133 is an equidigital number, since it uses as much as digits as its factorization.

20313133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 20313133 is about 4507.0093188277. The cubic root of 20313133 is about 272.8510549992.

Adding to 20313133 its reverse (33131302), we get a palindrome (53444435).

The spelling of 20313133 in words is "twenty million, three hundred thirteen thousand, one hundred thirty-three".