20826433 has 4 divisors (see below), whose sum is σ = 20836228. Its totient is φ = 20816640.

The previous prime is 20826427. The next prime is 20826439. The reversal of 20826433 is 33462802.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 33462802 = 2 ⋅16731401.

It is an interprime number because it is at equal distance from previous prime (20826427) and next prime (20826439).

It can be written as a sum of positive squares in 2 ways, for example, as 242064 + 20584369 = 492^2 + 4537^2 .

It is a cyclic number.

It is not a de Polignac number, because 20826433 - 2⁹ = 20825921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20826439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216 + ... + 6457.

It is an arithmetic number, because the mean of its divisors is an integer number (5209057).

Almost surely, 2^20826433 is an apocalyptic number.

It is an amenable number.

20826433 is a deficient number, since it is larger than the sum of its proper divisors (9795).

20826433 is an equidigital number, since it uses as much as digits as its factorization.

20826433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9794.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 20826433 is about 4563.5986896308. The cubic root of 20826433 is about 275.1302215217.

It can be divided in two parts, 2082 and 6433, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 20826433 in words is "twenty million, eight hundred twenty-six thousand, four hundred thirty-three".