20100406 has 4 divisors (see below), whose sum is σ = 30150612. Its totient is φ = 10050202.

The previous prime is 20100403. The next prime is 20100419. The reversal of 20100406 is 60400102.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100401) 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 as a sum of consecutive naturals, namely, 5025100 + ... + 5025103.

It is an arithmetic number, because the mean of its divisors is an integer number (7537653).

Almost surely, 2^20100406 is an apocalyptic number.

20100406 is a deficient number, since it is larger than the sum of its proper divisors (10050206).

20100406 is a wasteful number, since it uses less digits than its factorization.

20100406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10050205.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20100406 is about 4483.3476331866. The cubic root of 20100406 is about 271.8952433247.

Adding to 20100406 its reverse (60400102), we get a palindrome (80500508).

The spelling of 20100406 in words is "twenty million, one hundred thousand, four hundred six".