20172212 has 24 divisors (see below), whose sum is σ = 36664320. Its totient is φ = 9704160.

The previous prime is 20172211. The next prime is 20172221. The reversal of 20172212 is 21227102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20172211) 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, 10589 + ... + 12347.

It is an arithmetic number, because the mean of its divisors is an integer number (1527680).

Almost surely, 2^20172212 is an apocalyptic number.

It is an amenable number.

20172212 is a deficient number, since it is larger than the sum of its proper divisors (16492108).

20172212 is a wasteful number, since it uses less digits than its factorization.

20172212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1871 (or 1869 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 20172212 is about 4491.3485725336. The cubic root of 20172212 is about 272.2186282895.

Adding to 20172212 its reverse (21227102), we get a palindrome (41399314).

The spelling of 20172212 in words is "twenty million, one hundred seventy-two thousand, two hundred twelve".