20811274020 has 144 divisors (see below), whose sum is σ = 65603865600. Its totient is φ = 5334393600.

The previous prime is 20811274007. The next prime is 20811274037. The reversal of 20811274020 is 2047211802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 818905 + ... + 843935.

It is an arithmetic number, because the mean of its divisors is an integer number (455582400).

Almost surely, 2^20811274020 is an apocalyptic number.

20811274020 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 20811274020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32801932800).

20811274020 is an abundant number, since it is smaller than the sum of its proper divisors (44792591580).

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

20811274020 is a wasteful number, since it uses less digits than its factorization.

20811274020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25226 (or 25221 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

Adding to 20811274020 its reverse (2047211802), we get a palindrome (22858485822).

The spelling of 20811274020 in words is "twenty billion, eight hundred eleven million, two hundred seventy-four thousand, twenty".