1868813020 has 96 divisors (see below), whose sum is σ = 4427942400. Its totient is φ = 658969344.

The previous prime is 1868812993. The next prime is 1868813029. The reversal of 1868813020 is 203188681.

It is a super-3 number, since 3×1868813020³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1868813029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 320491 + ... + 326269.

It is an arithmetic number, because the mean of its divisors is an integer number (46124400).

Almost surely, 2^1868813020 is an apocalyptic number.

1868813020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1868813020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2213971200).

1868813020 is an abundant number, since it is smaller than the sum of its proper divisors (2559129380).

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

1868813020 is a wasteful number, since it uses less digits than its factorization.

1868813020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5867 (or 5865 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 1868813020 is about 43229.7700664716. The cubic root of 1868813020 is about 1231.7482399698.

The spelling of 1868813020 in words is "one billion, eight hundred sixty-eight million, eight hundred thirteen thousand, twenty".