20020404646 has 16 divisors (see below), whose sum is σ = 32815929168. Its totient is φ = 9084832000.

The previous prime is 20020404631. The next prime is 20020404647. The reversal of 20020404646 is 64640402002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020404647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 754255 + ... + 780346.

It is an arithmetic number, because the mean of its divisors is an integer number (2050995573).

Almost surely, 2^20020404646 is an apocalyptic number.

20020404646 is a deficient number, since it is larger than the sum of its proper divisors (12795524522).

20020404646 is a wasteful number, since it uses less digits than its factorization.

20020404646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535207.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 20020404646 its reverse (64640402002), we get a palindrome (84660806648).

The spelling of 20020404646 in words is "twenty billion, twenty million, four hundred four thousand, six hundred forty-six".