20071197 has 6 divisors (see below), whose sum is σ = 28991742. Its totient is φ = 13380792.

The previous prime is 20071189. The next prime is 20071199. The reversal of 20071197 is 79117002.

It can be written as a sum of positive squares in only one way, i.e., 11655396 + 8415801 = 3414^2 + 2901^2 .

It is not a de Polignac number, because 20071197 - 2³ = 20071189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20071197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20071199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1115058 + ... + 1115075.

It is an arithmetic number, because the mean of its divisors is an integer number (4831957).

Almost surely, 2^20071197 is an apocalyptic number.

It is an amenable number.

20071197 is a deficient number, since it is larger than the sum of its proper divisors (8920545).

20071197 is a wasteful number, since it uses less digits than its factorization.

20071197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2230139 (or 2230136 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 27.

The square root of 20071197 is about 4480.0889500098. The cubic root of 20071197 is about 271.7634775260.

Adding to 20071197 its reverse (79117002), we get a palindrome (99188199).

The spelling of 20071197 in words is "twenty million, seventy-one thousand, one hundred ninety-seven".