220387 has 4 divisors (see below), whose sum is σ = 223480. Its totient is φ = 217296.

The previous prime is 220373. The next prime is 220391. The reversal of 220387 is 783022.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1437 + ... + 1582.

It is an arithmetic number, because the mean of its divisors is an integer number (55870).

2²²⁰³⁸⁷ is an apocalyptic number.

220387 is a deficient number, since it is larger than the sum of its proper divisors (3093).

220387 is an equidigital number, since it uses as much as digits as its factorization.

220387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3092.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 220387 is about 469.4539381026. The cubic root of 220387 is about 60.4034842953.

The spelling of 220387 in words is "two hundred twenty thousand, three hundred eighty-seven".