20104040 has 32 divisors (see below), whose sum is σ = 49347360. Its totient is φ = 7310400.

The previous prime is 20104031. The next prime is 20104043. The reversal of 20104040 is 4040102.

It is a Harshad number since it is a multiple of its sum of digits (11).

It is not an unprimeable number, because it can be changed into a prime (20104043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22406 + ... + 23285.

It is an arithmetic number, because the mean of its divisors is an integer number (1542105).

Almost surely, 2^20104040 is an apocalyptic number.

20104040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20104040 is an abundant number, since it is smaller than the sum of its proper divisors (29243320).

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

20104040 is a wasteful number, since it uses less digits than its factorization.

20104040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45713 (or 45709 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 20104040 is about 4483.7528923883. The cubic root of 20104040 is about 271.9116278656.

Adding to 20104040 its reverse (4040102), we get a palindrome (24144142).

The spelling of 20104040 in words is "twenty million, one hundred four thousand, forty".