18202019840 has 48 divisors (see below), whose sum is σ = 43674206940. Its totient is φ = 7280803840.

The previous prime is 18202019839. The next prime is 18202019873. The reversal of 18202019840 is 4891020281.

It can be written as a sum of positive squares in 2 ways, for example, as 16887522304 + 1314497536 = 129952^2 + 36256^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18202019840.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 878531 + ... + 899010.

Almost surely, 2^18202019840 is an apocalyptic number.

18202019840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18202019840 is an abundant number, since it is smaller than the sum of its proper divisors (25472187100).

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

18202019840 is an equidigital number, since it uses as much as digits as its factorization.

18202019840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777568 (or 1777548 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The spelling of 18202019840 in words is "eighteen billion, two hundred two million, nineteen thousand, eight hundred forty".