20603394560 has 120 divisors (see below), whose sum is σ = 57465490500. Its totient is φ = 7063977984.

The previous prime is 20603394547. The next prime is 20603394563. The reversal of 20603394560 is 6549330602.

It can be written as a sum of positive squares in 2 ways, for example, as 16850116864 + 3753277696 = 129808^2 + 61264^2 .

It is not an unprimeable number, because it can be changed into a prime (20603394563) 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, 43316 + ... + 207564.

Almost surely, 2^20603394560 is an apocalyptic number.

20603394560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20603394560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28732745250).

20603394560 is an abundant number, since it is smaller than the sum of its proper divisors (36862095940).

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

20603394560 is an equidigital number, since it uses as much as digits as its factorization.

20603394560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164286 (or 164263 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 38.

The spelling of 20603394560 in words is "twenty billion, six hundred three million, three hundred ninety-four thousand, five hundred sixty".