18683203540 has 24 divisors (see below), whose sum is σ = 39237375240. Its totient is φ = 7472777088.

The previous prime is 18683203493. The next prime is 18683203547. The reversal of 18683203540 is 4530238681.

It can be written as a sum of positive squares in 4 ways, for example, as 7690939204 + 10992264336 = 87698^2 + 104844^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18683203493 and 18683203502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18683203547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456646 + ... + 495874.

It is an arithmetic number, because the mean of its divisors is an integer number (1634890635).

Almost surely, 2^18683203540 is an apocalyptic number.

18683203540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18683203540 is an abundant number, since it is smaller than the sum of its proper divisors (20554171700).

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

18683203540 is a wasteful number, since it uses less digits than its factorization.

18683203540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63051 (or 63049 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 18683203540 in words is "eighteen billion, six hundred eighty-three million, two hundred three thousand, five hundred forty".