20081197 has 2 divisors, whose sum is σ = 20081198. Its totient is φ = 20081196.

The previous prime is 20081161. The next prime is 20081203. The reversal of 20081197 is 79118002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12823561 + 7257636 = 3581^2 + 2694^2 .

It is a cyclic number.

It is not a de Polignac number, because 20081197 - 2¹¹ = 20079149 is a prime.

It is equal to p_1275463 and since 20081197 and 1275463 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20081107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10040598 + 10040599.

It is an arithmetic number, because the mean of its divisors is an integer number (10040599).

Almost surely, 2^20081197 is an apocalyptic number.

It is an amenable number.

20081197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20081197 is an equidigital number, since it uses as much as digits as its factorization.

20081197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 20081197 is about 4481.2048603026. The cubic root of 20081197 is about 271.8086032778.

Adding to 20081197 its reverse (79118002), we get a palindrome (99199199).

The spelling of 20081197 in words is "twenty million, eighty-one thousand, one hundred ninety-seven".