20816533 has 8 divisors (see below), whose sum is σ = 22505120. Its totient is φ = 19187280.

The previous prime is 20816527. The next prime is 20816539. The reversal of 20816533 is 33561802.

It is an interprime number because it is at equal distance from previous prime (20816527) and next prime (20816539).

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 20816533 - 2⁹ = 20816021 is a prime.

It is a super-2 number, since 2×20816533² = 866656092280178, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20816539) 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 7 ways as a sum of consecutive naturals, for example, 14103 + ... + 15508.

It is an arithmetic number, because the mean of its divisors is an integer number (2813140).

Almost surely, 2^20816533 is an apocalyptic number.

It is an amenable number.

20816533 is a deficient number, since it is larger than the sum of its proper divisors (1688587).

20816533 is a wasteful number, since it uses less digits than its factorization.

20816533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29667.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20816533 is about 4562.5138903898. The cubic root of 20816533 is about 275.0866195457.

The spelling of 20816533 in words is "twenty million, eight hundred sixteen thousand, five hundred thirty-three".