18227489420 has 144 divisors (see below), whose sum is σ = 49197274560. Its totient is φ = 5625962496.

The previous prime is 18227489411. The next prime is 18227489479. The reversal of 18227489420 is 2498472281.

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 47 ways as a sum of consecutive naturals, for example, 359396 + ... + 406964.

It is an arithmetic number, because the mean of its divisors is an integer number (341647740).

Almost surely, 2^18227489420 is an apocalyptic number.

18227489420 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 18227489420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24598637280).

18227489420 is an abundant number, since it is smaller than the sum of its proper divisors (30969785140).

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

18227489420 is a wasteful number, since it uses less digits than its factorization.

18227489420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47632 (or 47623 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 47.

The spelling of 18227489420 in words is "eighteen billion, two hundred twenty-seven million, four hundred eighty-nine thousand, four hundred twenty".