1200020220 has 72 divisors (see below), whose sum is σ = 4160074464. Its totient is φ = 274290048.

The previous prime is 1200020219. The next prime is 1200020233. The reversal of 1200020220 is 220200021.

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 23 ways as a sum of consecutive naturals, for example, 474939 + ... + 477458.

It is an arithmetic number, because the mean of its divisors is an integer number (57778812).

Almost surely, 2^1200020220 is an apocalyptic number.

1200020220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200020220 is an abundant number, since it is smaller than the sum of its proper divisors (2960054244).

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

1200020220 is a wasteful number, since it uses less digits than its factorization.

1200020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952419 (or 952414 counting only the distinct ones).

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

The square root of 1200020220 is about 34641.3080007092. The cubic root of 1200020220 is about 1062.6645377481.

Adding to 1200020220 its reverse (220200021), we get a palindrome (1420220241).

The spelling of 1200020220 in words is "one billion, two hundred million, twenty thousand, two hundred twenty".