1920220200 has 72 divisors (see below), whose sum is σ = 6448745550. Its totient is φ = 512058240.

The previous prime is 1920220177. The next prime is 1920220207. The reversal of 1920220200 is 20220291.

It can be written as a sum of positive squares in 3 ways, for example, as 1061847396 + 858372804 = 32586^2 + 29298^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1920220207) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 531595 + ... + 535194.

Almost surely, 2^1920220200 is an apocalyptic number.

1920220200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1920220200 is an abundant number, since it is smaller than the sum of its proper divisors (4528525350).

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

1920220200 is a wasteful number, since it uses less digits than its factorization.

1920220200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066811 (or 1066799 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1920220200 is about 43820.3172056068. The cubic root of 1920220200 is about 1242.9405153289.

Adding to 1920220200 its reverse (20220291), we get a palindrome (1940440491).

The spelling of 1920220200 in words is "one billion, nine hundred twenty million, two hundred twenty thousand, two hundred".