20404834 has 8 divisors (see below), whose sum is σ = 31434588. Its totient is φ = 9926640.

The previous prime is 20404817. The next prime is 20404837. The reversal of 20404834 is 43840402.

It can be written as a sum of positive squares in 2 ways, for example, as 20205025 + 199809 = 4495^2 + 447^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20404799 and 20404808.

It is not an unprimeable number, because it can be changed into a prime (20404837) 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 3 ways as a sum of consecutive naturals, for example, 137797 + ... + 137944.

Almost surely, 2^20404834 is an apocalyptic number.

20404834 is a deficient number, since it is larger than the sum of its proper divisors (11029754).

20404834 is a wasteful number, since it uses less digits than its factorization.

20404834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275780.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 20404834 is about 4517.1710173515. The cubic root of 20404834 is about 273.2610222491.

The spelling of 20404834 in words is "twenty million, four hundred four thousand, eight hundred thirty-four".