220447 has 2 divisors, whose sum is σ = 220448. Its totient is φ = 220446.

The previous prime is 220421. The next prime is 220469. The reversal of 220447 is 744022.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220447 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110223 + 110224.

It is an arithmetic number, because the mean of its divisors is an integer number (110224).

2²²⁰⁴⁴⁷ is an apocalyptic number.

220447 is a deficient number, since it is larger than the sum of its proper divisors (1).

220447 is an equidigital number, since it uses as much as digits as its factorization.

220447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 220447 is about 469.5178377868. The cubic root of 220447 is about 60.4089653812.

Adding to 220447 its reverse (744022), we get a palindrome (964469).

It can be divided in two parts, 2 and 20447, that added together give a square (20449 = 143²).

The spelling of 220447 in words is "two hundred twenty thousand, four hundred forty-seven", and thus it is an iban number.