220723447 has 4 divisors (see below), whose sum is σ = 252255376. Its totient is φ = 189191520.

The previous prime is 220723439. The next prime is 220723453. The reversal of 220723447 is 744327022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 744327022 = 2 ⋅372163511.

It is not a de Polignac number, because 220723447 - 2³ = 220723439 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 (220703447) 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, 15765954 + ... + 15765967.

It is an arithmetic number, because the mean of its divisors is an integer number (63063844).

Almost surely, 2^220723447 is an apocalyptic number.

220723447 is a deficient number, since it is larger than the sum of its proper divisors (31531929).

220723447 is an equidigital number, since it uses as much as digits as its factorization.

220723447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31531928.

The product of its (nonzero) digits is 18816, while the sum is 31.

The square root of 220723447 is about 14856.7643516346. The cubic root of 220723447 is about 604.3420637090.

The spelling of 220723447 in words is "two hundred twenty million, seven hundred twenty-three thousand, four hundred forty-seven".