20040006 has 32 divisors (see below), whose sum is σ = 46287360. Its totient is φ = 5665536.

The previous prime is 20039993. The next prime is 20040049. The reversal of 20040006 is 60004002.

It is a junction number, because it is equal to n+sod(n) for n = 20039973 and 20040000.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1615 + ... + 6533.

It is an arithmetic number, because the mean of its divisors is an integer number (1446480).

Almost surely, 2^20040006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20040006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23143680).

20040006 is an abundant number, since it is smaller than the sum of its proper divisors (26247354).

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

20040006 is a wasteful number, since it uses less digits than its factorization.

20040006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5028.

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

The square root of 20040006 is about 4476.6065272704. The cubic root of 20040006 is about 271.6226294351.

Adding to 20040006 its reverse (60004002), we get a palindrome (80044008).

The spelling of 20040006 in words is "twenty million, forty thousand, six".