220388887 has 4 divisors (see below), whose sum is σ = 220867416. Its totient is φ = 219910360.

The previous prime is 220388849. The next prime is 220388891. The reversal of 220388887 is 788883022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 788883022 = 2 ⋅394441511.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220388887 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 (220388837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238573 + ... + 239494.

It is an arithmetic number, because the mean of its divisors is an integer number (55216854).

Almost surely, 2^220388887 is an apocalyptic number.

220388887 is a deficient number, since it is larger than the sum of its proper divisors (478529).

220388887 is an equidigital number, since it uses as much as digits as its factorization.

220388887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478528.

The product of its (nonzero) digits is 344064, while the sum is 46.

The square root of 220388887 is about 14845.5005641440. The cubic root of 220388887 is about 604.0365669059.

The spelling of 220388887 in words is "two hundred twenty million, three hundred eighty-eight thousand, eight hundred eighty-seven".