220321992 has 64 divisors (see below), whose sum is σ = 607694400. Its totient is φ = 66007040.

The previous prime is 220321963. The next prime is 220321999. The reversal of 220321992 is 299123022.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (220321999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18808 + ... + 28184.

It is an arithmetic number, because the mean of its divisors is an integer number (9495225).

Almost surely, 2^220321992 is an apocalyptic number.

220321992 is a gapful number since it is divisible by the number (22) 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 220321992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303847200).

220321992 is an abundant number, since it is smaller than the sum of its proper divisors (387372408).

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

220321992 is a wasteful number, since it uses less digits than its factorization.

220321992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9486 (or 9482 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 220321992 is about 14843.2473535948. The cubic root of 220321992 is about 603.9754459852.

The spelling of 220321992 in words is "two hundred twenty million, three hundred twenty-one thousand, nine hundred ninety-two".