20404106 has 8 divisors (see below), whose sum is σ = 30693924. Its totient is φ = 10172800.

The previous prime is 20404093. The next prime is 20404123. The reversal of 20404106 is 60140402.

It can be written as a sum of positive squares in 2 ways, for example, as 18139081 + 2265025 = 4259^2 + 1505^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13745 + ... + 15156.

Almost surely, 2^20404106 is an apocalyptic number.

20404106 is a deficient number, since it is larger than the sum of its proper divisors (10289818).

20404106 is a wasteful number, since it uses less digits than its factorization.

20404106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29256.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20404106 is about 4517.0904352249. The cubic root of 20404106 is about 273.2577724245.

Adding to 20404106 its reverse (60140402), we get a palindrome (80544508).

The spelling of 20404106 in words is "twenty million, four hundred four thousand, one hundred six".