20404212 has 24 divisors (see below), whose sum is σ = 47740896. Its totient is φ = 6782688.

The previous prime is 20404187. The next prime is 20404213. The reversal of 20404212 is 21240402.

It is a junction number, because it is equal to n+sod(n) for n = 20404191 and 20404200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404213) 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, 2623 + ... + 6905.

It is an arithmetic number, because the mean of its divisors is an integer number (1989204).

Almost surely, 2^20404212 is an apocalyptic number.

It is an amenable number.

20404212 is an abundant number, since it is smaller than the sum of its proper divisors (27336684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20404212 is a wasteful number, since it uses less digits than its factorization.

20404212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4687 (or 4685 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 20404212 is about 4517.1021684261. The cubic root of 20404212 is about 273.2582456181.

Adding to 20404212 its reverse (21240402), we get a palindrome (41644614).

The spelling of 20404212 in words is "twenty million, four hundred four thousand, two hundred twelve".