20040646 has 4 divisors (see below), whose sum is σ = 30060972. Its totient is φ = 10020322.

The previous prime is 20040619. The next prime is 20040667. The reversal of 20040646 is 64604002.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5010160 + ... + 5010163.

It is an arithmetic number, because the mean of its divisors is an integer number (7515243).

Almost surely, 2^20040646 is an apocalyptic number.

20040646 is a deficient number, since it is larger than the sum of its proper divisors (10020326).

20040646 is a wasteful number, since it uses less digits than its factorization.

20040646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10020325.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20040646 is about 4476.6780094173. The cubic root of 20040646 is about 271.6255209284.

Adding to 20040646 its reverse (64604002), we get a palindrome (84644648).

The spelling of 20040646 in words is "twenty million, forty thousand, six hundred forty-six".