23781881520 has 120 divisors (see below), whose sum is σ = 82621609200. Its totient is φ = 6123145728.

The previous prime is 23781881503. The next prime is 23781881521. The reversal of 23781881520 is 2518818732.

23781881520 is a `hidden beast` number, since 2 + 37 + 8 + 18 + 81 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is not an unprimeable number, because it can be changed into a prime (23781881521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 548610 + ... + 590369.

It is an arithmetic number, because the mean of its divisors is an integer number (688513410).

Almost surely, 2^23781881520 is an apocalyptic number.

23781881520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23781881520 is an abundant number, since it is smaller than the sum of its proper divisors (58839727680).

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

23781881520 is a wasteful number, since it uses less digits than its factorization.

23781881520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139027 (or 1139018 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 23781881520 in words is "twenty-three billion, seven hundred eighty-one million, eight hundred eighty-one thousand, five hundred twenty".