220401145 has 4 divisors (see below), whose sum is σ = 264481380. Its totient is φ = 176320912.

The previous prime is 220401127. The next prime is 220401149. The reversal of 220401145 is 541104022.

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

It can be written as a sum of positive squares in 2 ways, for example, as 158684409 + 61716736 = 12597^2 + 7856^2 .

It is a cyclic number.

It is not a de Polignac number, because 220401145 - 2⁷ = 220401017 is a prime.

It is a super-2 number, since 2×220401145² = 97153329434622050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (220401149) 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, 22040110 + ... + 22040119.

It is an arithmetic number, because the mean of its divisors is an integer number (66120345).

Almost surely, 2^220401145 is an apocalyptic number.

It is an amenable number.

220401145 is a deficient number, since it is larger than the sum of its proper divisors (44080235).

220401145 is an equidigital number, since it uses as much as digits as its factorization.

220401145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44080234.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 220401145 is about 14845.9134107673. The cubic root of 220401145 is about 604.0477655089.

Adding to 220401145 its reverse (541104022), we get a palindrome (761505167).

The spelling of 220401145 in words is "two hundred twenty million, four hundred one thousand, one hundred forty-five".