18436949880020 has 96 divisors (see below), whose sum is σ = 44596882471680. Its totient is φ = 6271519288320.

The previous prime is 18436949879989. The next prime is 18436949880043. The reversal of 18436949880020 is 2008894963481.

It is a super-2 number, since 2×18436949880020² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79792016 + ... + 80022744.

It is an arithmetic number, because the mean of its divisors is an integer number (464550859080).

Almost surely, 2^{18436949880020} is an apocalyptic number.

18436949880020 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 18436949880020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22298441235840).

18436949880020 is an abundant number, since it is smaller than the sum of its proper divisors (26159932591660).

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

18436949880020 is a wasteful number, since it uses less digits than its factorization.

18436949880020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235233 (or 235231 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 62.

The spelling of 18436949880020 in words is "eighteen trillion, four hundred thirty-six billion, nine hundred forty-nine million, eight hundred eighty thousand, twenty".