220020640464 has 40 divisors (see below), whose sum is σ = 568793108800. Its totient is φ = 73287767808.

The previous prime is 220020640451. The next prime is 220020640493. The reversal of 220020640464 is 464046020022.

220020640464 is digitally balanced in base 3, 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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1571077 + ... + 1705380.

It is an arithmetic number, because the mean of its divisors is an integer number (14219827720).

Almost surely, 2^220020640464 is an apocalyptic number.

220020640464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

220020640464 is an abundant number, since it is smaller than the sum of its proper divisors (348772468336).

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

220020640464 is a wasteful number, since it uses less digits than its factorization.

220020640464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3277867 (or 3277861 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 220020640464 its reverse (464046020022), we get a palindrome (684066660486).

The spelling of 220020640464 in words is "two hundred twenty billion, twenty million, six hundred forty thousand, four hundred sixty-four".