20804475 has 24 divisors (see below), whose sum is σ = 35202112. Its totient is φ = 10836000.

The previous prime is 20804473. The next prime is 20804479. The reversal of 20804475 is 57440802.

20804475 is a nontrivial binomial coefficient, being equal to C(6451, 2).

It is not a de Polignac number, because 20804475 - 2¹ = 20804473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20804473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1 + ... + 6450.

Almost surely, 2^20804475 is an apocalyptic number.

20804475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20804475 is the 6450-th triangular number.

20804475 is a deficient number, since it is larger than the sum of its proper divisors (14397637).

20804475 is a wasteful number, since it uses less digits than its factorization.

20804475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6507 (or 6502 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 20804475 is about 4561.1922783413. The cubic root of 20804475 is about 275.0334945428.

It can be divided in two parts, 2080 and 4475, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 20804475 in words is "twenty million, eight hundred four thousand, four hundred seventy-five".