23661801920 has 224 divisors, whose sum is σ = 60126554880. Its totient is φ = 8856207360.

The previous prime is 23661801913. The next prime is 23661801959. The reversal of 23661801920 is 2910816632.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38349452 + ... + 38350068.

It is an arithmetic number, because the mean of its divisors is an integer number (268422120).

Almost surely, 2^23661801920 is an apocalyptic number.

23661801920 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 23661801920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30063277440).

23661801920 is an abundant number, since it is smaller than the sum of its proper divisors (36464752960).

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

23661801920 is a wasteful number, since it uses less digits than its factorization.

23661801920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 23661801920 in words is "twenty-three billion, six hundred sixty-one million, eight hundred one thousand, nine hundred twenty".