20404810 has 8 divisors (see below), whose sum is σ = 36728676. Its totient is φ = 8161920.

The previous prime is 20404801. The next prime is 20404817. The reversal of 20404810 is 1840402.

It can be written as a sum of positive squares in 2 ways, for example, as 20403289 + 1521 = 4517^2 + 39^2 .

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

It is a super-2 number, since 2×20404810² = 832712542272200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20404817) 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, 1020231 + ... + 1020250.

Almost surely, 2^20404810 is an apocalyptic number.

20404810 is a deficient number, since it is larger than the sum of its proper divisors (16323866).

20404810 is a wasteful number, since it uses less digits than its factorization.

20404810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040488.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 20404810 is about 4517.1683608207. The cubic root of 20404810 is about 273.2609151132.

The spelling of 20404810 in words is "twenty million, four hundred four thousand, eight hundred ten".