220505145 has 24 divisors (see below), whose sum is σ = 410410944. Its totient is φ = 100802016.

The previous prime is 220505123. The next prime is 220505167. The reversal of 220505145 is 541505022.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (220505123) and next prime (220505167).

It is not a de Polignac number, because 220505145 - 2⁶ = 220505081 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149269 + ... + 150738.

It is an arithmetic number, because the mean of its divisors is an integer number (17100456).

Almost surely, 2^220505145 is an apocalyptic number.

It is an amenable number.

220505145 is a deficient number, since it is larger than the sum of its proper divisors (189905799).

220505145 is a wasteful number, since it uses less digits than its factorization.

220505145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300029 (or 300022 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 220505145 is about 14849.4156450683. The cubic root of 220505145 is about 604.1427606131.

The spelling of 220505145 in words is "two hundred twenty million, five hundred five thousand, one hundred forty-five".