18220143580 has 24 divisors (see below), whose sum is σ = 38264838192. Its totient is φ = 7287574272.

The previous prime is 18220143569. The next prime is 18220143583. The reversal of 18220143580 is 8534102281.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220143583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 569284 + ... + 600436.

It is an arithmetic number, because the mean of its divisors is an integer number (1594368258).

Almost surely, 2^18220143580 is an apocalyptic number.

18220143580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18220143580 is an abundant number, since it is smaller than the sum of its proper divisors (20044694612).

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

18220143580 is a wasteful number, since it uses less digits than its factorization.

18220143580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60405 (or 60403 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The spelling of 18220143580 in words is "eighteen billion, two hundred twenty million, one hundred forty-three thousand, five hundred eighty".