220639938 has 8 divisors (see below), whose sum is σ = 441279888. Its totient is φ = 73546644.

The previous prime is 220639933. The next prime is 220639963. The reversal of 220639938 is 839936022.

It is a sphenic number, since it is the product of 3 distinct primes.

220639938 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 220639938.

It is not an unprimeable number, because it can be changed into a prime (220639931) 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, 18386656 + ... + 18386667.

It is an arithmetic number, because the mean of its divisors is an integer number (55159986).

Almost surely, 2^220639938 is an apocalyptic number.

220639938 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

220639938 is a wasteful number, since it uses less digits than its factorization.

220639938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36773328.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 220639938 is about 14853.9536151154. The cubic root of 220639938 is about 604.2658380548.

The spelling of 220639938 in words is "two hundred twenty million, six hundred thirty-nine thousand, nine hundred thirty-eight".