18367946820 has 144 divisors (see below), whose sum is σ = 59874691968. Its totient is φ = 4541137920.

The previous prime is 18367946791. The next prime is 18367946897. The reversal of 18367946820 is 2864976381.

It is a super-2 number, since 2×18367946820² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 160225 + ... + 249815.

It is an arithmetic number, because the mean of its divisors is an integer number (415796472).

Almost surely, 2^18367946820 is an apocalyptic number.

18367946820 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 18367946820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29937345984).

18367946820 is an abundant number, since it is smaller than the sum of its proper divisors (41506745148).

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

18367946820 is a wasteful number, since it uses less digits than its factorization.

18367946820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89690 (or 89685 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 18367946820 in words is "eighteen billion, three hundred sixty-seven million, nine hundred forty-six thousand, eight hundred twenty".