220638151836 has 72 divisors (see below), whose sum is σ = 559100525984. Its totient is φ = 73364797440.

The previous prime is 220638151819. The next prime is 220638151897. The reversal of 220638151836 is 638151836022.

220638151836 is a `hidden beast` number, since 2 + 2 + 0 + 638 + 1 + 5 + 1 + 8 + 3 + 6 = 666.

220638151836 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 220638151791 and 220638151800.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27031596 + ... + 27039756.

Almost surely, 2^220638151836 is an apocalyptic number.

It is an amenable number.

220638151836 is an abundant number, since it is smaller than the sum of its proper divisors (338462374148).

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

220638151836 is a wasteful number, since it uses less digits than its factorization.

220638151836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9931 (or 9926 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

Adding to 220638151836 its reverse (638151836022), we get a palindrome (858789987858).

The spelling of 220638151836 in words is "two hundred twenty billion, six hundred thirty-eight million, one hundred fifty-one thousand, eight hundred thirty-six".