1820112020 has 12 divisors (see below), whose sum is σ = 3822235284. Its totient is φ = 728044800.

The previous prime is 1820112013. The next prime is 1820112023. The reversal of 1820112020 is 202110281.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 201980944 + 1618131076 = 14212^2 + 40226^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1820112020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820112023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45502781 + ... + 45502820.

It is an arithmetic number, because the mean of its divisors is an integer number (318519607).

Almost surely, 2^1820112020 is an apocalyptic number.

1820112020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820112020 is an abundant number, since it is smaller than the sum of its proper divisors (2002123264).

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

1820112020 is a wasteful number, since it uses less digits than its factorization.

1820112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91005610 (or 91005608 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 1820112020 is about 42662.7708898520. The cubic root of 1820112020 is about 1220.9541984057.

The spelling of 1820112020 in words is "one billion, eight hundred twenty million, one hundred twelve thousand, twenty".