220636840 has 16 divisors (see below), whose sum is σ = 496432980. Its totient is φ = 88254720.

The previous prime is 220636837. The next prime is 220636849. The reversal of 220636840 is 48636022.

It can be written as a sum of positive squares in 2 ways, for example, as 220166244 + 470596 = 14838^2 + 686^2 .

It is not an unprimeable number, because it can be changed into a prime (220636849) 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 3 ways as a sum of consecutive naturals, for example, 2757921 + ... + 2758000.

Almost surely, 2^220636840 is an apocalyptic number.

220636840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220636840 is an abundant number, since it is smaller than the sum of its proper divisors (275796140).

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

220636840 is a wasteful number, since it uses less digits than its factorization.

220636840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5515932 (or 5515928 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 220636840 is about 14853.8493327487. The cubic root of 220636840 is about 604.2630098809.

The spelling of 220636840 in words is "two hundred twenty million, six hundred thirty-six thousand, eight hundred forty".