20561040300 has 36 divisors (see below), whose sum is σ = 59489944136. Its totient is φ = 5482944000.

The previous prime is 20561040289. The next prime is 20561040329. The reversal of 20561040300 is 304016502.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34268101 + ... + 34268700.

Almost surely, 2^20561040300 is an apocalyptic number.

20561040300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20561040300 is an abundant number, since it is smaller than the sum of its proper divisors (38928903836).

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

20561040300 is a wasteful number, since it uses less digits than its factorization.

20561040300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68536818 (or 68536811 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 20561040300 its reverse (304016502), we get a palindrome (20865056802).

The spelling of 20561040300 in words is "twenty billion, five hundred sixty-one million, forty thousand, three hundred".