201818382020 has 24 divisors (see below), whose sum is σ = 424168050264. Its totient is φ = 80660791296.

The previous prime is 201818381953. The next prime is 201818382041. The reversal of 201818382020 is 20283818102.

It can be written as a sum of positive squares in 4 ways, for example, as 32054605444 + 169763776576 = 179038^2 + 412024^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4135229 + ... + 4183748.

It is an arithmetic number, because the mean of its divisors is an integer number (17673668761).

Almost surely, 2^201818382020 is an apocalyptic number.

201818382020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201818382020 is an abundant number, since it is smaller than the sum of its proper divisors (222349668244).

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

201818382020 is a wasteful number, since it uses less digits than its factorization.

201818382020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8320199 (or 8320197 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The spelling of 201818382020 in words is "two hundred one billion, eight hundred eighteen million, three hundred eighty-two thousand, twenty".