220636836 has 36 divisors (see below), whose sum is σ = 637396032. Its totient is φ = 63039024.

The previous prime is 220636807. The next prime is 220636837. The reversal of 220636836 is 638636022.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×220636836² = 97361226800181792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 220636836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220636837) 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 11 ways as a sum of consecutive naturals, for example, 437520 + ... + 438023.

Almost surely, 2^220636836 is an apocalyptic number.

It is an amenable number.

220636836 is an abundant number, since it is smaller than the sum of its proper divisors (416759196).

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

220636836 is a wasteful number, since it uses less digits than its factorization.

220636836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875560 (or 875555 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 220636836 is about 14853.8491981035. The cubic root of 220636836 is about 604.2630062293.

The spelling of 220636836 in words is "two hundred twenty million, six hundred thirty-six thousand, eight hundred thirty-six".