1020213220 has 24 divisors (see below), whose sum is σ = 2307252024. Its totient is φ = 376694016.

The previous prime is 1020213217. The next prime is 1020213241. The reversal of 1020213220 is 223120201.

It can be written as a sum of positive squares in 4 ways, for example, as 192155044 + 828058176 = 13862^2 + 28776^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 1020213220.

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 7 ways as a sum of consecutive naturals, for example, 1961689 + ... + 1962208.

It is an arithmetic number, because the mean of its divisors is an integer number (96135501).

Almost surely, 2^1020213220 is an apocalyptic number.

1020213220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020213220 is an abundant number, since it is smaller than the sum of its proper divisors (1287038804).

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

1020213220 is a wasteful number, since it uses less digits than its factorization.

1020213220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3923919 (or 3923917 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1020213220 is about 31940.7767594966. The cubic root of 1020213220 is about 1006.6928458805.

Adding to 1020213220 its reverse (223120201), we get a palindrome (1243333421).

The spelling of 1020213220 in words is "one billion, twenty million, two hundred thirteen thousand, two hundred twenty".