20040406 has 8 divisors (see below), whose sum is σ = 31367664. Its totient is φ = 9584520.

The previous prime is 20040403. The next prime is 20040409. The reversal of 20040406 is 60404002.

It is an interprime number because it is at equal distance from previous prime (20040403) and next prime (20040409).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20040406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20040403) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 217785 + ... + 217876.

It is an arithmetic number, because the mean of its divisors is an integer number (3920958).

Almost surely, 2^20040406 is an apocalyptic number.

20040406 is a deficient number, since it is larger than the sum of its proper divisors (11327258).

20040406 is a wasteful number, since it uses less digits than its factorization.

20040406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435686.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20040406 is about 4476.6512037459. The cubic root of 20040406 is about 271.6244366256.

Adding to 20040406 its reverse (60404002), we get a palindrome (80444408).

The spelling of 20040406 in words is "twenty million, forty thousand, four hundred six".