18343573920 has 576 divisors, whose sum is σ = 76320631296. Its totient is φ = 3916431360.

The previous prime is 18343573907. The next prime is 18343573973. The reversal of 18343573920 is 2937534381.

18343573920 is a `hidden beast` number, since 18 + 3 + 43 + 573 + 9 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 28616800 + ... + 28617440.

It is an arithmetic number, because the mean of its divisors is an integer number (132501096).

Almost surely, 2^18343573920 is an apocalyptic number.

18343573920 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 18343573920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38160315648).

18343573920 is an abundant number, since it is smaller than the sum of its proper divisors (57977057376).

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

18343573920 is a wasteful number, since it uses less digits than its factorization.

18343573920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853 (or 842 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 18343573920 in words is "eighteen billion, three hundred forty-three million, five hundred seventy-three thousand, nine hundred twenty".