63640020 has 48 divisors (see below), whose sum is σ = 178899840. Its totient is φ = 16903296.

The previous prime is 63639997. The next prime is 63640033. The reversal of 63640020 is 2004636.

63640020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 in 15 ways as a sum of consecutive naturals, for example, 14169 + ... + 18111.

It is an arithmetic number, because the mean of its divisors is an integer number (3727080).

Almost surely, 2^63640020 is an apocalyptic number.

63640020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

63640020 is an abundant number, since it is smaller than the sum of its proper divisors (115259820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63640020 is a wasteful number, since it uses less digits than its factorization.

63640020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4224 (or 4222 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 63640020 is about 7977.4695236021. The cubic root of 63640020 is about 399.2486311626.

Adding to 63640020 its reverse (2004636), we get a palindrome (65644656).

The spelling of 63640020 in words is "sixty-three million, six hundred forty thousand, twenty".