20323151 has 2 divisors, whose sum is σ = 20323152. Its totient is φ = 20323150.

The previous prime is 20323139. The next prime is 20323157. The reversal of 20323151 is 15132302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20323151 - 2¹⁸ = 20061007 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20323157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10161575 + 10161576.

It is an arithmetic number, because the mean of its divisors is an integer number (10161576).

Almost surely, 2^20323151 is an apocalyptic number.

20323151 is a deficient number, since it is larger than the sum of its proper divisors (1).

20323151 is an equidigital number, since it uses as much as digits as its factorization.

20323151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 20323151 is about 4508.1205618306. The cubic root of 20323151 is about 272.8959023834.

Adding to 20323151 its reverse (15132302), we get a palindrome (35455453).

The spelling of 20323151 in words is "twenty million, three hundred twenty-three thousand, one hundred fifty-one".