20004775 has 24 divisors (see below), whose sum is σ = 28728320. Its totient is φ = 13534560.

The previous prime is 20004773. The next prime is 20004811. The reversal of 20004775 is 57740002.

It is not a de Polignac number, because 20004775 - 2¹ = 20004773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004773) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13102 + ... + 14548.

Almost surely, 2^20004775 is an apocalyptic number.

20004775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20004775 is a deficient number, since it is larger than the sum of its proper divisors (8723545).

20004775 is a wasteful number, since it uses less digits than its factorization.

20004775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543 (or 1538 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 20004775 is about 4472.6697843682. The cubic root of 20004775 is about 271.4633621807.

Adding to 20004775 its reverse (57740002), we get a palindrome (77744777).

The spelling of 20004775 in words is "twenty million, four thousand, seven hundred seventy-five".