220405469 has 4 divisors (see below), whose sum is σ = 223424796. Its totient is φ = 217386144.

The previous prime is 220405447. The next prime is 220405499. The reversal of 220405469 is 964504022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75516100 + 144889369 = 8690^2 + 12037^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220405469 is a prime.

It is a super-2 number, since 2×220405469² = 97157141530219922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220405439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1509554 + ... + 1509699.

It is an arithmetic number, because the mean of its divisors is an integer number (55856199).

Almost surely, 2^220405469 is an apocalyptic number.

It is an amenable number.

220405469 is a deficient number, since it is larger than the sum of its proper divisors (3019327).

220405469 is an equidigital number, since it uses as much as digits as its factorization.

220405469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3019326.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 220405469 is about 14846.0590393545. The cubic root of 220405469 is about 604.0517157084.

The spelling of 220405469 in words is "two hundred twenty million, four hundred five thousand, four hundred sixty-nine".