20811499407712 has 24 divisors (see below), whose sum is σ = 44124380956656. Its totient is φ = 9605307418752.

The previous prime is 20811499407707. The next prime is 20811499407781. The reversal of 20811499407712 is 21770499411802.

It is a happy number.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25013820988 + ... + 25013821819.

It is an arithmetic number, because the mean of its divisors is an integer number (1838515873194).

Almost surely, 2^{20811499407712} is an apocalyptic number.

It is an amenable number.

20811499407712 is an abundant number, since it is smaller than the sum of its proper divisors (23312881548944).

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

20811499407712 is a wasteful number, since it uses less digits than its factorization.

20811499407712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50027642830 (or 50027642822 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 20811499407712 in words is "twenty trillion, eight hundred eleven billion, four hundred ninety-nine million, four hundred seven thousand, seven hundred twelve".