23287220 has 48 divisors (see below), whose sum is σ = 53778816. Its totient is φ = 8400000.

The previous prime is 23287211. The next prime is 23287283. The reversal of 23287220 is 2278232.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 23287220.

It is a congruent number.

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, 32870 + ... + 33570.

It is an arithmetic number, because the mean of its divisors is an integer number (1120392).

Almost surely, 2^23287220 is an apocalyptic number.

23287220 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 23287220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26889408).

23287220 is an abundant number, since it is smaller than the sum of its proper divisors (30491596).

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

23287220 is a wasteful number, since it uses less digits than its factorization.

23287220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872 (or 870 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 23287220 is about 4825.6833712957. The cubic root of 23287220 is about 285.5655947748.

The spelling of 23287220 in words is "twenty-three million, two hundred eighty-seven thousand, two hundred twenty".