220001023 has 4 divisors (see below), whose sum is σ = 240001128. Its totient is φ = 200000920.

The previous prime is 220000997. The next prime is 220001027. The reversal of 220001023 is 320100022.

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

It is a cyclic number.

It is not a de Polignac number, because 220001023 - 2¹³ = 219992831 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 (220001027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10000036 + ... + 10000057.

It is an arithmetic number, because the mean of its divisors is an integer number (60000282).

Almost surely, 2^220001023 is an apocalyptic number.

220001023 is a deficient number, since it is larger than the sum of its proper divisors (20000105).

220001023 is a wasteful number, since it uses less digits than its factorization.

220001023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20000104.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 220001023 is about 14832.4314594742. The cubic root of 220001023 is about 603.6820093840.

Adding to 220001023 its reverse (320100022), we get a palindrome (540101045).

The spelling of 220001023 in words is "two hundred twenty million, one thousand, twenty-three".