20331151 has 2 divisors, whose sum is σ = 20331152. Its totient is φ = 20331150.

The previous prime is 20331139. The next prime is 20331161. The reversal of 20331151 is 15113302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20331151 - 2⁷ = 20331023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20331161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165575 + 10165576.

It is an arithmetic number, because the mean of its divisors is an integer number (10165576).

Almost surely, 2^20331151 is an apocalyptic number.

20331151 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331151 is an equidigital number, since it uses as much as digits as its factorization.

20331151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 20331151 is about 4509.0077622466. The cubic root of 20331151 is about 272.9317052439.

Adding to 20331151 its reverse (15113302), we get a palindrome (35444453).

The spelling of 20331151 in words is "twenty million, three hundred thirty-one thousand, one hundred fifty-one".