20400006 has 16 divisors (see below), whose sum is σ = 44509248. Its totient is φ = 6181800.

The previous prime is 20399993. The next prime is 20400013. The reversal of 20400006 is 60000402.

It is a junction number, because it is equal to n+sod(n) for n = 20399964 and 20400000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154480 + ... + 154611.

It is an arithmetic number, because the mean of its divisors is an integer number (2781828).

Almost surely, 2^20400006 is an apocalyptic number.

20400006 is an abundant number, since it is smaller than the sum of its proper divisors (24109242).

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

20400006 is a wasteful number, since it uses less digits than its factorization.

20400006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309107.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 20400006 is about 4516.6365804656. The cubic root of 20400006 is about 273.2394683976.

Adding to 20400006 its reverse (60000402), we get a palindrome (80400408).

The spelling of 20400006 in words is "twenty million, four hundred thousand, six".