20382191 has 2 divisors, whose sum is σ = 20382192. Its totient is φ = 20382190.

The previous prime is 20382169. The next prime is 20382217. The reversal of 20382191 is 19128302.

It is an a-pointer prime, because the next prime (20382217) can be obtained adding 20382191 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20382191 - 2⁶ = 20382127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20382191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20382101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10191095 + 10191096.

It is an arithmetic number, because the mean of its divisors is an integer number (10191096).

Almost surely, 2^20382191 is an apocalyptic number.

20382191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20382191 is an equidigital number, since it uses as much as digits as its factorization.

20382191 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 26.

The square root of 20382191 is about 4514.6639963568. The cubic root of 20382191 is about 273.1599066760.

The spelling of 20382191 in words is "twenty million, three hundred eighty-two thousand, one hundred ninety-one".