320021992 has 16 divisors (see below), whose sum is σ = 608493600. Its totient is φ = 157757040.

The previous prime is 320021987. The next prime is 320021993. The reversal of 320021992 is 299120023.

It is a super-3 number, since 3×320021992³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 320021992.

It is not an unprimeable number, because it can be changed into a prime (320021993) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 281142 + ... + 282277.

It is an arithmetic number, because the mean of its divisors is an integer number (38030850).

Almost surely, 2^320021992 is an apocalyptic number.

It is an amenable number.

320021992 is a deficient number, since it is larger than the sum of its proper divisors (288471608).

320021992 is a wasteful number, since it uses less digits than its factorization.

320021992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563496 (or 563492 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 320021992 is about 17889.1585045245. The cubic root of 320021992 is about 684.0060473913.

The spelling of 320021992 in words is "three hundred twenty million, twenty-one thousand, nine hundred ninety-two".