18910820000 has 120 divisors (see below), whose sum is σ = 46737929700. Its totient is φ = 7529472000.

The previous prime is 18910819997. The next prime is 18910820011. The reversal of 18910820000 is 2801981.

It can be written as a sum of positive squares in 10 ways, for example, as 169744 + 18910650256 = 412^2 + 137516^2 .

It is a super-2 number, since 2×18910820000² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4577936 + ... + 4582064.

Almost surely, 2^18910820000 is an apocalyptic number.

18910820000 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 18910820000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23368964850).

18910820000 is an abundant number, since it is smaller than the sum of its proper divisors (27827109700).

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

18910820000 is an equidigital number, since it uses as much as digits as its factorization.

18910820000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4388 (or 4365 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 18910820000 in words is "eighteen billion, nine hundred ten million, eight hundred twenty thousand".