1020011220 has 72 divisors (see below), whose sum is σ = 3276045864. Its totient is φ = 256002048.

The previous prime is 1020011207. The next prime is 1020011297. The reversal of 1020011220 is 221100201.

It can be written as a sum of positive squares in 4 ways, for example, as 152473104 + 867538116 = 12348^2 + 29454^2 .

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

1020011220 is a modest number, since divided by 11220 gives 1020 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 163609 + ... + 169728.

It is an arithmetic number, because the mean of its divisors is an integer number (45500637).

Almost surely, 2^1020011220 is an apocalyptic number.

1020011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020011220 is an abundant number, since it is smaller than the sum of its proper divisors (2256034644).

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

1020011220 is a wasteful number, since it uses less digits than its factorization.

1020011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333369 (or 333364 counting only the distinct ones).

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

The square root of 1020011220 is about 31937.6145007732. The cubic root of 1020011220 is about 1006.6264004965.

Adding to 1020011220 its reverse (221100201), we get a palindrome (1241111421).

The spelling of 1020011220 in words is "one billion, twenty million, eleven thousand, two hundred twenty".