20110001820 has 48 divisors (see below), whose sum is σ = 56680931328. Its totient is φ = 5327150400.

The previous prime is 20110001801. The next prime is 20110001837. The reversal of 20110001820 is 2810001102.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20110001820.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1100764 + ... + 1118883.

It is an arithmetic number, because the mean of its divisors is an integer number (1180852736).

Almost surely, 2^20110001820 is an apocalyptic number.

20110001820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20110001820 is an abundant number, since it is smaller than the sum of its proper divisors (36570929508).

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

20110001820 is a wasteful number, since it uses less digits than its factorization.

20110001820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2219810 (or 2219808 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20110001820 its reverse (2810001102), we get a palindrome (22920002922).

The spelling of 20110001820 in words is "twenty billion, one hundred ten million, one thousand, eight hundred twenty".