220857929 has 4 divisors (see below), whose sum is σ = 224154384. Its totient is φ = 217561476.

The previous prime is 220857911. The next prime is 220857977. The reversal of 220857929 is 929758022.

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, and also an emirpimes, since its reverse is a distinct semiprime: 929758022 = 2 ⋅464879011.

It is a cyclic number.

It is not a de Polignac number, because 220857929 - 2¹² = 220853833 is a prime.

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 220857929.

It is not an unprimeable number, because it can be changed into a prime (220857229) 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, 1648127 + ... + 1648260.

It is an arithmetic number, because the mean of its divisors is an integer number (56038596).

Almost surely, 2^220857929 is an apocalyptic number.

It is an amenable number.

220857929 is a deficient number, since it is larger than the sum of its proper divisors (3296455).

220857929 is an equidigital number, since it uses as much as digits as its factorization.

220857929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3296454.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 220857929 is about 14861.2896142966. The cubic root of 220857929 is about 604.4647762861.

The spelling of 220857929 in words is "two hundred twenty million, eight hundred fifty-seven thousand, nine hundred twenty-nine".