220897638 has 64 divisors (see below), whose sum is σ = 530611200. Its totient is φ = 67716000.

The previous prime is 220897637. The next prime is 220897639. The reversal of 220897638 is 836798022.

220897638 is a `hidden beast` number, since 2 + 2 + 0 + 8 + 9 + 7 + 638 = 666.

220897638 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (220897637) and next prime (220897639).

It is a junction number, because it is equal to n+sod(n) for n = 220897593 and 220897602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220897637) 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 31 ways as a sum of consecutive naturals, for example, 293763 + ... + 294513.

It is an arithmetic number, because the mean of its divisors is an integer number (8290800).

Almost surely, 2^220897638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220897638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265305600).

220897638 is an abundant number, since it is smaller than the sum of its proper divisors (309713562).

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

220897638 is a wasteful number, since it uses less digits than its factorization.

220897638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194 (or 1188 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 220897638 is about 14862.6255419424. The cubic root of 220897638 is about 604.5010005587.

The spelling of 220897638 in words is "two hundred twenty million, eight hundred ninety-seven thousand, six hundred thirty-eight".