20484785 has 4 divisors (see below), whose sum is σ = 24581748. Its totient is φ = 16387824.

The previous prime is 20484773. The next prime is 20484799. The reversal of 20484785 is 58748402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10942864 + 9541921 = 3308^2 + 3089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20484785 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2048474 + ... + 2048483.

It is an arithmetic number, because the mean of its divisors is an integer number (6145437).

Almost surely, 2^20484785 is an apocalyptic number.

It is an amenable number.

20484785 is a deficient number, since it is larger than the sum of its proper divisors (4096963).

20484785 is an equidigital number, since it uses as much as digits as its factorization.

20484785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4096962.

The product of its (nonzero) digits is 71680, while the sum is 38.

The square root of 20484785 is about 4526.0120415218. The cubic root of 20484785 is about 273.6174577124.

The spelling of 20484785 in words is "twenty million, four hundred eighty-four thousand, seven hundred eighty-five".