23210440220 has 72 divisors (see below), whose sum is σ = 54454473024. Its totient is φ = 8301744000.

The previous prime is 23210440217. The next prime is 23210440237. The reversal of 23210440220 is 2204401232.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 23210440192 and 23210440201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69005 + ... + 226235.

Almost surely, 2^23210440220 is an apocalyptic number.

23210440220 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 23210440220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27227236512).

23210440220 is an abundant number, since it is smaller than the sum of its proper divisors (31244032804).

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

23210440220 is a wasteful number, since it uses less digits than its factorization.

23210440220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157323 (or 157310 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 23210440220 its reverse (2204401232), we get a palindrome (25414841452).

The spelling of 23210440220 in words is "twenty-three billion, two hundred ten million, four hundred forty thousand, two hundred twenty".