220404402 has 28 divisors (see below), whose sum is σ = 495686430. Its totient is φ = 73467648.

The previous prime is 220404347. The next prime is 220404409. The reversal of 220404402 is 204404022.

220404402 is a `hidden beast` number, since 220 + 4 + 0 + 440 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 124344801 + 96059601 = 11151^2 + 9801^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (220404409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 74127 + ... + 77042.

Almost surely, 2^220404402 is an apocalyptic number.

220404402 is an abundant number, since it is smaller than the sum of its proper divisors (275282028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220404402 is an equidigital number, since it uses as much as digits as its factorization.

220404402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151189 (or 151174 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 220404402 is about 14846.0231038484. The cubic root of 220404402 is about 604.0507409531.

Adding to 220404402 its reverse (204404022), we get a palindrome (424808424).

The spelling of 220404402 in words is "two hundred twenty million, four hundred four thousand, four hundred two".