20504146 has 8 divisors (see below), whose sum is σ = 33122124. Its totient is φ = 9463440.

The previous prime is 20504137. The next prime is 20504147. The reversal of 20504146 is 64140502.

It can be written as a sum of positive squares in 2 ways, for example, as 19580625 + 923521 = 4425^2 + 961^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20504147) 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, 394285 + ... + 394336.

Almost surely, 2^20504146 is an apocalyptic number.

20504146 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20504146 is a deficient number, since it is larger than the sum of its proper divisors (12617978).

20504146 is a wasteful number, since it uses less digits than its factorization.

20504146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788636.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20504146 is about 4528.1503950289. The cubic root of 20504146 is about 273.7036328828.

Adding to 20504146 its reverse (64140502), we get a palindrome (84644648).

The spelling of 20504146 in words is "twenty million, five hundred four thousand, one hundred forty-six".