20818104 has 32 divisors (see below), whose sum is σ = 52304640. Its totient is φ = 6904800.

The previous prime is 20818099. The next prime is 20818121. The reversal of 20818104 is 40181802.

It is a Harshad number since it is a multiple of its sum of digits (24).

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 7 ways as a sum of consecutive naturals, for example, 3009 + ... + 7119.

It is an arithmetic number, because the mean of its divisors is an integer number (1634520).

Almost surely, 2^20818104 is an apocalyptic number.

20818104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20818104 is an abundant number, since it is smaller than the sum of its proper divisors (31486536).

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

20818104 is a wasteful number, since it uses less digits than its factorization.

20818104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4331 (or 4327 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 20818104 is about 4562.6860510011. The cubic root of 20818104 is about 275.0935395294.

Adding to 20818104 its reverse (40181802), we get a palindrome (60999906).

The spelling of 20818104 in words is "twenty million, eight hundred eighteen thousand, one hundred four".