20533445 has 8 divisors (see below), whose sum is σ = 24894744. Its totient is φ = 16257024.

The previous prime is 20533427. The next prime is 20533451. The reversal of 20533445 is 54433502.

It can be written as a sum of positive squares in 4 ways, for example, as 4268356 + 16265089 = 2066^2 + 4033^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20533445 - 2²⁴ = 3756229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 20684 + ... + 21653.

It is an arithmetic number, because the mean of its divisors is an integer number (3111843).

Almost surely, 2^20533445 is an apocalyptic number.

It is an amenable number.

20533445 is a deficient number, since it is larger than the sum of its proper divisors (4361299).

20533445 is an equidigital number, since it uses as much as digits as its factorization.

20533445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42439.

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 20533445 is about 4531.3844462813. The cubic root of 20533445 is about 273.8339386613.

Adding to 20533445 its reverse (54433502), we get a palindrome (74966947).

It can be divided in two parts, 205334 and 45, that added together give a cube (205379 = 59³).

The spelling of 20533445 in words is "twenty million, five hundred thirty-three thousand, four hundred forty-five".