20005785042500 has 30 divisors (see below), whose sum is σ = 43748650736406. Its totient is φ = 8002314016000.

The previous prime is 20005785042499. The next prime is 20005785042521. The reversal of 20005785042500 is 524058750002.

It can be written as a sum of positive squares in 5 ways, for example, as 9672299041024 + 10333486001476 = 3110032^2 + 3214574^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4001154509 + ... + 4001159508.

Almost surely, 2^{20005785042500} is an apocalyptic number.

20005785042500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20005785042500 is an abundant number, since it is smaller than the sum of its proper divisors (23742865693906).

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

20005785042500 is an equidigital number, since it uses as much as digits as its factorization.

20005785042500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8002314041 (or 8002314024 counting only the distinct ones).

The product of its (nonzero) digits is 112000, while the sum is 38.

The spelling of 20005785042500 in words is "twenty trillion, five billion, seven hundred eighty-five million, forty-two thousand, five hundred".