220939687 has 8 divisors (see below), whose sum is σ = 222674400. Its totient is φ = 219212160.

The previous prime is 220939681. The next prime is 220939709. The reversal of 220939687 is 786939022.

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

It is a cyclic number.

It is not a de Polignac number, because 220939687 - 2¹⁵ = 220906919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220939681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70939 + ... + 73987.

It is an arithmetic number, because the mean of its divisors is an integer number (27834300).

Almost surely, 2^220939687 is an apocalyptic number.

220939687 is a deficient number, since it is larger than the sum of its proper divisors (1734713).

220939687 is a wasteful number, since it uses less digits than its factorization.

220939687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3593.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 220939687 is about 14864.0400631861. The cubic root of 220939687 is about 604.5393547486.

The spelling of 220939687 in words is "two hundred twenty million, nine hundred thirty-nine thousand, six hundred eighty-seven".