20718196 has 12 divisors (see below), whose sum is σ = 36596448. Its totient is φ = 10262072.

The previous prime is 20718179. The next prime is 20718197. The reversal of 20718196 is 69181702.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20718197) 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 3 ways as a sum of consecutive naturals, for example, 23776 + ... + 24631.

It is an arithmetic number, because the mean of its divisors is an integer number (3049704).

Almost surely, 2^20718196 is an apocalyptic number.

It is an amenable number.

20718196 is a deficient number, since it is larger than the sum of its proper divisors (15878252).

20718196 is a wasteful number, since it uses less digits than its factorization.

20718196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48518 (or 48516 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 20718196 is about 4551.7245083594. The cubic root of 20718196 is about 274.6527672557.

Adding to 20718196 its reverse (69181702), we get a palindrome (89899898).

The spelling of 20718196 in words is "twenty million, seven hundred eighteen thousand, one hundred ninety-six".