18220944372 has 48 divisors (see below), whose sum is σ = 43694138880. Its totient is φ = 5905498752.

The previous prime is 18220944353. The next prime is 18220944373. The reversal of 18220944372 is 27344902281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220944373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 682654 + ... + 708842.

It is an arithmetic number, because the mean of its divisors is an integer number (910294560).

Almost surely, 2^18220944372 is an apocalyptic number.

18220944372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18220944372 is an abundant number, since it is smaller than the sum of its proper divisors (25473194508).

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

18220944372 is a wasteful number, since it uses less digits than its factorization.

18220944372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27800 (or 27798 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 18220944372 in words is "eighteen billion, two hundred twenty million, nine hundred forty-four thousand, three hundred seventy-two".