220636494 has 64 divisors (see below), whose sum is σ = 536014080. Its totient is φ = 66860640.

The previous prime is 220636469. The next prime is 220636499. The reversal of 220636494 is 494636022.

220636494 is a `hidden beast` number, since 2 + 2 + 0 + 6 + 3 + 649 + 4 = 666.

220636494 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×220636494² = 97360924969224072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220636499) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44689 + ... + 49379.

It is an arithmetic number, because the mean of its divisors is an integer number (8375220).

Almost surely, 2^220636494 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220636494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268007040).

220636494 is an abundant number, since it is smaller than the sum of its proper divisors (315377586).

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

220636494 is a wasteful number, since it uses less digits than its factorization.

220636494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4782 (or 4776 counting only the distinct ones).

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

The square root of 220636494 is about 14853.8376859315. The cubic root of 220636494 is about 604.2626940148.

The spelling of 220636494 in words is "two hundred twenty million, six hundred thirty-six thousand, four hundred ninety-four".