20404158 has 8 divisors (see below), whose sum is σ = 40808328. Its totient is φ = 6801384.

The previous prime is 20404133. The next prime is 20404159. The reversal of 20404158 is 85140402.

It is a sphenic number, since it is the product of 3 distinct primes.

20404158 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1700341 + ... + 1700352.

It is an arithmetic number, because the mean of its divisors is an integer number (5101041).

Almost surely, 2^20404158 is an apocalyptic number.

20404158 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20404158 is a wasteful number, since it uses less digits than its factorization.

20404158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3400698.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 20404158 is about 4517.0961911387. The cubic root of 20404158 is about 273.2580045574.

The spelling of 20404158 in words is "twenty million, four hundred four thousand, one hundred fifty-eight".