20811841736 has 96 divisors (see below), whose sum is σ = 46642780800. Its totient is φ = 8675170560.

The previous prime is 20811841679. The next prime is 20811841763. The reversal of 20811841736 is 63714811802.

It is a super-3 number, since 3×20811841736³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 20811841693 and 20811841702.

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, 5768045 + ... + 5771651.

It is an arithmetic number, because the mean of its divisors is an integer number (485862300).

Almost surely, 2^20811841736 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 20811841736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23321390400).

20811841736 is an abundant number, since it is smaller than the sum of its proper divisors (25830939064).

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

20811841736 is a wasteful number, since it uses less digits than its factorization.

20811841736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4027 (or 4016 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The spelling of 20811841736 in words is "twenty billion, eight hundred eleven million, eight hundred forty-one thousand, seven hundred thirty-six".