20504386 has 16 divisors (see below), whose sum is σ = 35633664. Its totient is φ = 8666784.

The previous prime is 20504383. The next prime is 20504389. The reversal of 20504386 is 68340502.

It is an interprime number because it is at equal distance from previous prime (20504383) and next prime (20504389).

It is not an unprimeable number, because it can be changed into a prime (20504381) 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 7 ways as a sum of consecutive naturals, for example, 9010 + ... + 11053.

It is an arithmetic number, because the mean of its divisors is an integer number (2227104).

Almost surely, 2^20504386 is an apocalyptic number.

20504386 is a deficient number, since it is larger than the sum of its proper divisors (15129278).

20504386 is a wasteful number, since it uses less digits than its factorization.

20504386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20145.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20504386 is about 4528.1768958379. The cubic root of 20504386 is about 273.7047007744.

Adding to 20504386 its reverse (68340502), we get a palindrome (88844888).

The spelling of 20504386 in words is "twenty million, five hundred four thousand, three hundred eighty-six".