20811107436 has 96 divisors (see below), whose sum is σ = 58592002560. Its totient is φ = 5616221184.

The previous prime is 20811107389. The next prime is 20811107441. The reversal of 20811107436 is 63470111802.

It is a junction number, because it is equal to n+sod(n) for n = 20811107397 and 20811107406.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 518506 + ... + 557198.

It is an arithmetic number, because the mean of its divisors is an integer number (610333360).

Almost surely, 2^20811107436 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20811107436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29296001280).

20811107436 is an abundant number, since it is smaller than the sum of its proper divisors (37780895124).

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

20811107436 is a wasteful number, since it uses less digits than its factorization.

20811107436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39063 (or 39061 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The spelling of 20811107436 in words is "twenty billion, eight hundred eleven million, one hundred seven thousand, four hundred thirty-six".