20406412 has 18 divisors (see below), whose sum is σ = 38670828. Its totient is φ = 9418032.

The previous prime is 20406403. The next prime is 20406439. The reversal of 20406412 is 21460402.

It is a self number, because there is not a number n which added to its sum of digits gives 20406412.

It is an unprimeable number.

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, 14418 + ... + 15769.

Almost surely, 2^20406412 is an apocalyptic number.

It is an amenable number.

20406412 is a deficient number, since it is larger than the sum of its proper divisors (18264416).

20406412 is a wasteful number, since it uses less digits than its factorization.

20406412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30217 (or 30202 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 20406412 is about 4517.3456808174. The cubic root of 20406412 is about 273.2680662462.

Adding to 20406412 its reverse (21460402), we get a palindrome (41866814).

The spelling of 20406412 in words is "twenty million, four hundred six thousand, four hundred twelve".