220420640644 has 24 divisors (see below), whose sum is σ = 396773899200. Its totient is φ = 107065879776.

The previous prime is 220420640639. The next prime is 220420640653. The reversal of 220420640644 is 446046024022.

220420640644 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×220420640644² (a number of 23 digits) contains 22 as substring.

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, 1055194 + ... + 1246705.

It is an arithmetic number, because the mean of its divisors is an integer number (16532245800).

Almost surely, 2^220420640644 is an apocalyptic number.

It is an amenable number.

220420640644 is a deficient number, since it is larger than the sum of its proper divisors (176353258556).

220420640644 is a wasteful number, since it uses less digits than its factorization.

220420640644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302587 (or 2302585 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 34.

Adding to 220420640644 its reverse (446046024022), we get a palindrome (666466664666).

The spelling of 220420640644 in words is "two hundred twenty billion, four hundred twenty million, six hundred forty thousand, six hundred forty-four".