19820001816 has 48 divisors (see below), whose sum is σ = 53819400960. Its totient is φ = 6589408320.

The previous prime is 19820001809. The next prime is 19820001823. The reversal of 19820001816 is 61810002891.

It is an interprime number because it is at equal distance from previous prime (19820001809) and next prime (19820001823).

It is a super-3 number, since 3×19820001816³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 331795 + ... + 386946.

It is an arithmetic number, because the mean of its divisors is an integer number (1121237520).

Almost surely, 2^19820001816 is an apocalyptic number.

It is an amenable number.

19820001816 is an abundant number, since it is smaller than the sum of its proper divisors (33999399144).

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

19820001816 is a wasteful number, since it uses less digits than its factorization.

19820001816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719136 (or 719129 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The spelling of 19820001816 in words is "nineteen billion, eight hundred twenty million, one thousand, eight hundred sixteen".