20104642 has 16 divisors (see below), whose sum is σ = 32019192. Its totient is φ = 9434880.

The previous prime is 20104639. The next prime is 20104657. The reversal of 20104642 is 24640102.

It can be written as a sum of positive squares in 4 ways, for example, as 20079361 + 25281 = 4481^2 + 159^2 .

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 7 ways as a sum of consecutive naturals, for example, 17848 + ... + 18940.

Almost surely, 2^20104642 is an apocalyptic number.

20104642 is a deficient number, since it is larger than the sum of its proper divisors (11914550).

20104642 is a wasteful number, since it uses less digits than its factorization.

20104642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 20104642 is about 4483.8200231499. The cubic root of 20104642 is about 271.9143419000.

Adding to 20104642 its reverse (24640102), we get a palindrome (44744744).

The spelling of 20104642 in words is "twenty million, one hundred four thousand, six hundred forty-two".