20503631300000 has 144 divisors (see below), whose sum is σ = 50746615618104. Its totient is φ = 8154038400000.

The previous prime is 20503631299993. The next prime is 20503631300039. The reversal of 20503631300000 is 313630502.

It can be written as a sum of positive squares in 12 ways, for example, as 9247364738704 + 11256266561296 = 3040948^2 + 3355036^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16707410 + ... + 17892590.

Almost surely, 2^{20503631300000} is an apocalyptic number.

20503631300000 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 20503631300000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25373307809052).

20503631300000 is an abundant number, since it is smaller than the sum of its proper divisors (30242984318104).

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

20503631300000 is an equidigital number, since it uses as much as digits as its factorization.

20503631300000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185389 (or 1185361 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 23.

Adding to 20503631300000 its reverse (313630502), we get a palindrome (20503944930502).

The spelling of 20503631300000 in words is "twenty trillion, five hundred three billion, six hundred thirty-one million, three hundred thousand".