20443091 has 2 divisors, whose sum is σ = 20443092. Its totient is φ = 20443090.

The previous prime is 20443081. The next prime is 20443097. The reversal of 20443091 is 19034402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20443091 is a prime.

It is not a weakly prime, because it can be changed into another prime (20443097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221545 + 10221546.

It is an arithmetic number, because the mean of its divisors is an integer number (10221546).

Almost surely, 2^20443091 is an apocalyptic number.

20443091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20443091 is an equidigital number, since it uses as much as digits as its factorization.

20443091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20443091 is about 4521.4036537341. The cubic root of 20443091 is about 273.4316945554.

Adding to 20443091 its reverse (19034402), we get a palindrome (39477493).

The spelling of 20443091 in words is "twenty million, four hundred forty-three thousand, ninety-one".