20323091 has 2 divisors, whose sum is σ = 20323092. Its totient is φ = 20323090.

The previous prime is 20323067. The next prime is 20323139. The reversal of 20323091 is 19032302.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20323091 is a prime.

It is not a weakly prime, because it can be changed into another prime (20323021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10161545 + 10161546.

It is an arithmetic number, because the mean of its divisors is an integer number (10161546).

Almost surely, 2^20323091 is an apocalyptic number.

20323091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20323091 is an equidigital number, since it uses as much as digits as its factorization.

20323091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 20323091 is about 4508.1139071678. The cubic root of 20323091 is about 272.8956338264.

Adding to 20323091 its reverse (19032302), we get a palindrome (39355393).

The spelling of 20323091 in words is "twenty million, three hundred twenty-three thousand, ninety-one".