20011000181820 has 48 divisors (see below), whose sum is σ = 56118212162208. Its totient is φ = 5327941795840.

The previous prime is 20011000181791. The next prime is 20011000182007. The reversal of 20011000181820 is 2818100011002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260114949 + ... + 260191868.

It is an arithmetic number, because the mean of its divisors is an integer number (1169129420046).

Almost surely, 2^{20011000181820} is an apocalyptic number.

20011000181820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011000181820 is an abundant number, since it is smaller than the sum of its proper divisors (36107211980388).

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

20011000181820 is a wasteful number, since it uses less digits than its factorization.

20011000181820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520307470 (or 520307468 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 24.

Adding to 20011000181820 its reverse (2818100011002), we get a palindrome (22829100192822).

The spelling of 20011000181820 in words is "twenty trillion, eleven billion, one hundred eighty-one thousand, eight hundred twenty".