220520389 has 4 divisors (see below), whose sum is σ = 230108256. Its totient is φ = 210932524.

The previous prime is 220520351. The next prime is 220520423. The reversal of 220520389 is 983025022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220520389 is a prime.

It is a super-2 number, since 2×220520389² = 97258483929422642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220520389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220520309) 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, 4793899 + ... + 4793944.

It is an arithmetic number, because the mean of its divisors is an integer number (57527064).

Almost surely, 2^220520389 is an apocalyptic number.

It is an amenable number.

220520389 is a deficient number, since it is larger than the sum of its proper divisors (9587867).

220520389 is an equidigital number, since it uses as much as digits as its factorization.

220520389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9587866.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 220520389 is about 14849.9289223888. The cubic root of 220520389 is about 604.1566821930.

The spelling of 220520389 in words is "two hundred twenty million, five hundred twenty thousand, three hundred eighty-nine".