20101830 has 32 divisors (see below), whose sum is σ = 55137024. Its totient is φ = 4594656.

The previous prime is 20101817. The next prime is 20101847. The reversal of 20101830 is 3810102.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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, 47652 + ... + 48071.

It is an arithmetic number, because the mean of its divisors is an integer number (1723032).

Almost surely, 2^20101830 is an apocalyptic number.

20101830 is an abundant number, since it is smaller than the sum of its proper divisors (35035194).

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

20101830 is a wasteful number, since it uses less digits than its factorization.

20101830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95740.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 20101830 is about 4483.5064402764. The cubic root of 20101830 is about 271.9016639194.

Adding to 20101830 its reverse (3810102), we get a palindrome (23911932).

The spelling of 20101830 in words is "twenty million, one hundred one thousand, eight hundred thirty".