20217190 has 16 divisors (see below), whose sum is σ = 41589792. Its totient is φ = 6931584.

The previous prime is 20217173. The next prime is 20217193. The reversal of 20217190 is 9171202.

It is a super-2 number, since 2×20217190² = 817469542992200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20217193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144339 + ... + 144478.

It is an arithmetic number, because the mean of its divisors is an integer number (2599362).

Almost surely, 2^20217190 is an apocalyptic number.

20217190 is an abundant number, since it is smaller than the sum of its proper divisors (21372602).

20217190 is a wasteful number, since it uses less digits than its factorization.

20217190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288831.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 20217190 is about 4496.3529665719. The cubic root of 20217190 is about 272.4208001465.

Adding to 20217190 its reverse (9171202), we get a palindrome (29388392).

The spelling of 20217190 in words is "twenty million, two hundred seventeen thousand, one hundred ninety".