20406012 has 24 divisors (see below), whose sum is σ = 51942912. Its totient is φ = 6183600.

The previous prime is 20406011. The next prime is 20406017. The reversal of 20406012 is 21060402.

It is a junction number, because it is equal to n+sod(n) for n = 20405982 and 20406000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20406011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77164 + ... + 77427.

It is an arithmetic number, because the mean of its divisors is an integer number (2164288).

Almost surely, 2^20406012 is an apocalyptic number.

20406012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20406012 is an abundant number, since it is smaller than the sum of its proper divisors (31536900).

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

20406012 is a wasteful number, since it uses less digits than its factorization.

20406012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154609 (or 154607 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20406012 is about 4517.3014068136. The cubic root of 20406012 is about 273.2662807300.

Adding to 20406012 its reverse (21060402), we get a palindrome (41466414).

The spelling of 20406012 in words is "twenty million, four hundred six thousand, twelve".