18720041123520 has 336 divisors, whose sum is σ = 70899186428928. Its totient is φ = 4495777966080.

The previous prime is 18720041123501. The next prime is 18720041123551. The reversal of 18720041123520 is 2532114002781.

18720041123520 is a `hidden beast` number, since 1 + 8 + 7 + 2 + 0 + 0 + 4 + 1 + 123 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 628497 + ... + 6151023.

Almost surely, 2^{18720041123520} is an apocalyptic number.

18720041123520 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 18720041123520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35449593214464).

18720041123520 is an abundant number, since it is smaller than the sum of its proper divisors (52179145305408).

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

18720041123520 is a wasteful number, since it uses less digits than its factorization.

18720041123520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5522668 (or 5522655 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 18720041123520 in words is "eighteen trillion, seven hundred twenty billion, forty-one million, one hundred twenty-three thousand, five hundred twenty".