10020011220 has 144 divisors (see below), whose sum is σ = 30723153552. Its totient is φ = 2643240960.

The previous prime is 10020011201. The next prime is 10020011233. The reversal of 10020011220 is 2211002001.

It can be written as a sum of positive squares in 8 ways, for example, as 1602756 + 10018408464 = 1266^2 + 100092^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7254930 + ... + 7256310.

It is an arithmetic number, because the mean of its divisors is an integer number (213355233).

Almost surely, 2^10020011220 is an apocalyptic number.

10020011220 is a gapful number since it is divisible by the number (10) 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 10020011220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15361576776).

10020011220 is an abundant number, since it is smaller than the sum of its proper divisors (20703142332).

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

10020011220 is a wasteful number, since it uses less digits than its factorization.

10020011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802 (or 1797 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 10020011220 its reverse (2211002001), we get a palindrome (12231013221).

The spelling of 10020011220 in words is "ten billion, twenty million, eleven thousand, two hundred twenty".