2001002220 has 108 divisors (see below), whose sum is σ = 7060710384. Its totient is φ = 457369920.

The previous prime is 2001002207. The next prime is 2001002239. The reversal of 2001002220 is 222001002.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 104616 + ... + 122255.

It is an arithmetic number, because the mean of its divisors is an integer number (65376948).

Almost surely, 2^2001002220 is an apocalyptic number.

2001002220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001002220 is an abundant number, since it is smaller than the sum of its proper divisors (5059708164).

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

2001002220 is a wasteful number, since it uses less digits than its factorization.

2001002220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226900 (or 226888 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 2001002220 is about 44732.5633068350. The cubic root of 2001002220 is about 1260.1314677637.

Adding to 2001002220 its reverse (222001002), we get a palindrome (2223003222).

The spelling of 2001002220 in words is "two billion, one million, two thousand, two hundred twenty".