23555557920 has 96 divisors (see below), whose sum is σ = 74576956608. Its totient is φ = 6249571328.

The previous prime is 23555557919. The next prime is 23555557997. The reversal of 23555557920 is 2975555532.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 23555557920.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29994 + ... + 219113.

It is an arithmetic number, because the mean of its divisors is an integer number (776843298).

Almost surely, 2^23555557920 is an apocalyptic number.

23555557920 is a gapful number since it is divisible by the number (20) 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 23555557920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37288478304).

23555557920 is an abundant number, since it is smaller than the sum of its proper divisors (51021398688).

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

23555557920 is a wasteful number, since it uses less digits than its factorization.

23555557920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249322 (or 249314 counting only the distinct ones).

The product of its (nonzero) digits is 2362500, while the sum is 48.

The spelling of 23555557920 in words is "twenty-three billion, five hundred fifty-five million, five hundred fifty-seven thousand, nine hundred twenty".