220497138738 has 90 divisors (see below), whose sum is σ = 501484063311. Its totient is φ = 72413285256.

The previous prime is 220497138707. The next prime is 220497138751. The reversal of 220497138738 is 837831794022.

220497138738 is a `hidden beast` number, since 220 + 4 + 9 + 7 + 1 + 387 + 38 = 666.

220497138738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 110248569369 + 110248569369 = 332037^2 + 332037^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332037.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 44 ways as a sum of consecutive naturals, for example, 472156381 + ... + 472156847.

Almost surely, 2^220497138738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220497138738

220497138738 is an abundant number, since it is smaller than the sum of its proper divisors (280986924573).

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

220497138738 is an frugal number, since it uses more digits than its factorization.

220497138738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106 (or 551 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 54.

The spelling of 220497138738 in words is "two hundred twenty billion, four hundred ninety-seven million, one hundred thirty-eight thousand, seven hundred thirty-eight".