220123512 has 192 divisors, whose sum is σ = 726835200. Its totient is φ = 58786560.

The previous prime is 220123499. The next prime is 220123537. The reversal of 220123512 is 215321022.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1216062 + ... + 1216242.

It is an arithmetic number, because the mean of its divisors is an integer number (3785600).

Almost surely, 2^220123512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220123512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (363417600).

220123512 is an abundant number, since it is smaller than the sum of its proper divisors (506711688).

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

220123512 is a wasteful number, since it uses less digits than its factorization.

220123512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 220123512 is about 14836.5599786473. The cubic root of 220123512 is about 603.7940250550.

Adding to 220123512 its reverse (215321022), we get a palindrome (435444534).

The spelling of 220123512 in words is "two hundred twenty million, one hundred twenty-three thousand, five hundred twelve".