20101812 has 48 divisors (see below), whose sum is σ = 48491520. Its totient is φ = 6477408.

The previous prime is 20101771. The next prime is 20101817. The reversal of 20101812 is 21810102.

It is a junction number, because it is equal to n+sod(n) for n = 20101791 and 20101800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83989 + ... + 84227.

It is an arithmetic number, because the mean of its divisors is an integer number (1010240).

Almost surely, 2^20101812 is an apocalyptic number.

It is an amenable number.

20101812 is an abundant number, since it is smaller than the sum of its proper divisors (28389708).

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

20101812 is a wasteful number, since it uses less digits than its factorization.

20101812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452 (or 450 counting only the distinct ones).

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

The square root of 20101812 is about 4483.5044329185. The cubic root of 20101812 is about 271.9015827621.

Adding to 20101812 its reverse (21810102), we get a palindrome (41911914).

The spelling of 20101812 in words is "twenty million, one hundred one thousand, eight hundred twelve".