220231928 has 16 divisors (see below), whose sum is σ = 471925680. Its totient is φ = 94385088.

The previous prime is 220231927. The next prime is 220231933. The reversal of 220231928 is 829132022.

It is a super-2 number, since 2×220231928² = 97004204221194368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 220231928.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220231927) 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, 1966301 + ... + 1966412.

It is an arithmetic number, because the mean of its divisors is an integer number (29495355).

Almost surely, 2^220231928 is an apocalyptic number.

220231928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

220231928 is an abundant number, since it is smaller than the sum of its proper divisors (251693752).

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

220231928 is a wasteful number, since it uses less digits than its factorization.

220231928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3932726 (or 3932722 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 220231928 is about 14840.2132060156. The cubic root of 220231928 is about 603.8931363651.

The spelling of 220231928 in words is "two hundred twenty million, two hundred thirty-one thousand, nine hundred twenty-eight".