20331100 has 18 divisors (see below), whose sum is σ = 44118704. Its totient is φ = 8132400.

The previous prime is 20331079. The next prime is 20331107. The reversal of 20331100 is 113302.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331107) 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 5 ways as a sum of consecutive naturals, for example, 101556 + ... + 101755.

Almost surely, 2^20331100 is an apocalyptic number.

20331100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20331100 is an abundant number, since it is smaller than the sum of its proper divisors (23787604).

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

20331100 is a wasteful number, since it uses less digits than its factorization.

20331100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203325 (or 203318 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 20331100 is about 4509.0021068968. The cubic root of 20331100 is about 272.9314770304.

Adding to 20331100 its reverse (113302), we get a palindrome (20444402).

The spelling of 20331100 in words is "twenty million, three hundred thirty-one thousand, one hundred".