220722947 has 8 divisors (see below), whose sum is σ = 222235776. Its totient is φ = 219215232.

The previous prime is 220722911. The next prime is 220722977. The reversal of 220722947 is 749227022.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220722947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220722977) 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, 123323 + ... + 125099.

It is an arithmetic number, because the mean of its divisors is an integer number (27779472).

Almost surely, 2^220722947 is an apocalyptic number.

220722947 is a deficient number, since it is larger than the sum of its proper divisors (1512829).

220722947 is a wasteful number, since it uses less digits than its factorization.

220722947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 220722947 is about 14856.7475242733. The cubic root of 220722947 is about 604.3416073744.

Adding to 220722947 its reverse (749227022), we get a palindrome (969949969).

The spelling of 220722947 in words is "two hundred twenty million, seven hundred twenty-two thousand, nine hundred forty-seven".