220781465 has 16 divisors (see below), whose sum is σ = 281565072. Its totient is φ = 165617664.

The previous prime is 220781459. The next prime is 220781467. The reversal of 220781465 is 564187022.

It can be written as a sum of positive squares in 8 ways, for example, as 22619536 + 198161929 = 4756^2 + 14077^2 .

It is a cyclic number.

It is not a de Polignac number, because 220781465 - 2⁶ = 220781401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220781467) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18857 + ... + 28233.

It is an arithmetic number, because the mean of its divisors is an integer number (17597817).

Almost surely, 2^220781465 is an apocalyptic number.

It is an amenable number.

220781465 is a deficient number, since it is larger than the sum of its proper divisors (60783607).

220781465 is a wasteful number, since it uses less digits than its factorization.

220781465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9676.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 220781465 is about 14858.7168019315. The cubic root of 220781465 is about 604.3950102758.

The spelling of 220781465 in words is "two hundred twenty million, seven hundred eighty-one thousand, four hundred sixty-five".