20826403 has 16 divisors (see below), whose sum is σ = 23115456. Its totient is φ = 18645120.

The previous prime is 20826397. The next prime is 20826409. The reversal of 20826403 is 30462802.

It is a happy number.

20826403 is nontrivially palindromic in base 7.

It is an interprime number because it is at equal distance from previous prime (20826397) and next prime (20826409).

It is not a de Polignac number, because 20826403 - 2⁹ = 20825891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20826409) 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 15 ways as a sum of consecutive naturals, for example, 114973 + ... + 115153.

It is an arithmetic number, because the mean of its divisors is an integer number (1444716).

Almost surely, 2^20826403 is an apocalyptic number.

20826403 is a deficient number, since it is larger than the sum of its proper divisors (2289053).

20826403 is a wasteful number, since it uses less digits than its factorization.

20826403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20826403 is about 4563.5954027499. The cubic root of 20826403 is about 275.1300894154.

The spelling of 20826403 in words is "twenty million, eight hundred twenty-six thousand, four hundred three".