1818202020 has 48 divisors (see below), whose sum is σ = 5390437248. Its totient is φ = 456332800.

The previous prime is 1818202019. The next prime is 1818202039. The reversal of 1818202020 is 202028181.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 890256 + ... + 892295.

It is an arithmetic number, because the mean of its divisors is an integer number (112300776).

Almost surely, 2^1818202020 is an apocalyptic number.

1818202020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1818202020 is an abundant number, since it is smaller than the sum of its proper divisors (3572235228).

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

1818202020 is a wasteful number, since it uses less digits than its factorization.

1818202020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782580 (or 1782578 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 1818202020 is about 42640.3801577800. The cubic root of 1818202020 is about 1220.5269648618.

The spelling of 1818202020 in words is "one billion, eight hundred eighteen million, two hundred two thousand, twenty".