220145447 has 8 divisors (see below), whose sum is σ = 222478080. Its totient is φ = 217818720.

The previous prime is 220145383. The next prime is 220145503. The reversal of 220145447 is 744541022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220145447 - 2⁶ = 220145383 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 (220145147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148922 + ... + 150392.

It is an arithmetic number, because the mean of its divisors is an integer number (27809760).

Almost surely, 2^220145447 is an apocalyptic number.

220145447 is a deficient number, since it is larger than the sum of its proper divisors (2332633).

220145447 is a wasteful number, since it uses less digits than its factorization.

220145447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2953.

The product of its (nonzero) digits is 8960, while the sum is 29.

The square root of 220145447 is about 14837.2991814548. The cubic root of 220145447 is about 603.8140801322.

Adding to 220145447 its reverse (744541022), we get a palindrome (964686469).

The spelling of 220145447 in words is "two hundred twenty million, one hundred forty-five thousand, four hundred forty-seven".