220101840 has 160 divisors (see below), whose sum is σ = 866492160. Its totient is φ = 50305536.

The previous prime is 220101811. The next prime is 220101841. The reversal of 220101840 is 48101022.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220101841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7842 + ... + 22398.

It is an arithmetic number, because the mean of its divisors is an integer number (5415576).

Almost surely, 2^220101840 is an apocalyptic number.

220101840 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 220101840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (433246080).

220101840 is an abundant number, since it is smaller than the sum of its proper divisors (646390320).

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

220101840 is a wasteful number, since it uses less digits than its factorization.

220101840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14586 (or 14574 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 220101840 is about 14835.8296026882. The cubic root of 220101840 is about 603.7742091292.

Adding to 220101840 its reverse (48101022), we get a palindrome (268202862).

The spelling of 220101840 in words is "two hundred twenty million, one hundred one thousand, eight hundred forty".