23201940 has 144 divisors (see below), whose sum is σ = 73579968. Its totient is φ = 5440512.

The previous prime is 23201939. The next prime is 23201947. The reversal of 23201940 is 4910232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23201947) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 539559 + ... + 539601.

It is an arithmetic number, because the mean of its divisors is an integer number (510972).

Almost surely, 2^23201940 is an apocalyptic number.

23201940 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 23201940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36789984).

23201940 is an abundant number, since it is smaller than the sum of its proper divisors (50378028).

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

23201940 is a wasteful number, since it uses less digits than its factorization.

23201940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 23201940 is about 4816.8392125957. The cubic root of 23201940 is about 285.2165789877.

The spelling of 23201940 in words is "twenty-three million, two hundred one thousand, nine hundred forty".