20103820 has 24 divisors (see below), whose sum is σ = 46056528. Its totient is φ = 7310400.

The previous prime is 20103803. The next prime is 20103821. The reversal of 20103820 is 2830102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20103794 and 20103803.

It is not an unprimeable number, because it can be changed into a prime (20103821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45471 + ... + 45910.

It is an arithmetic number, because the mean of its divisors is an integer number (1919022).

Almost surely, 2^20103820 is an apocalyptic number.

20103820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20103820 is an abundant number, since it is smaller than the sum of its proper divisors (25952708).

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

20103820 is a wasteful number, since it uses less digits than its factorization.

20103820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91401 (or 91399 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 20103820 is about 4483.7283593010. The cubic root of 20103820 is about 271.9106360123.

Adding to 20103820 its reverse (2830102), we get a palindrome (22933922).

The spelling of 20103820 in words is "twenty million, one hundred three thousand, eight hundred twenty".