220644547640 has 64 divisors (see below), whose sum is σ = 542180165760. Its totient is φ = 80145774720.

The previous prime is 220644547609. The next prime is 220644547667. The reversal of 220644547640 is 46745446022.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 220644547591 and 220644547600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122639 + ... + 675521.

It is an arithmetic number, because the mean of its divisors is an integer number (8471565090).

Almost surely, 2^220644547640 is an apocalyptic number.

220644547640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220644547640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271090082880).

220644547640 is an abundant number, since it is smaller than the sum of its proper divisors (321535618120).

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

220644547640 is a wasteful number, since it uses less digits than its factorization.

220644547640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553812 (or 553808 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 44.

The spelling of 220644547640 in words is "two hundred twenty billion, six hundred forty-four million, five hundred forty-seven thousand, six hundred forty".