20916529 has 8 divisors (see below), whose sum is σ = 21532608. Its totient is φ = 20309520.

The previous prime is 20916527. The next prime is 20916557. The reversal of 20916529 is 92561902.

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 20916529 - 2¹ = 20916527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20916494 and 20916503.

It is not an unprimeable number, because it can be changed into a prime (20916521) 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, 2559 + ... + 6955.

It is an arithmetic number, because the mean of its divisors is an integer number (2691576).

Almost surely, 2^20916529 is an apocalyptic number.

It is an amenable number.

20916529 is a deficient number, since it is larger than the sum of its proper divisors (616079).

20916529 is an equidigital number, since it uses as much as digits as its factorization.

20916529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4535.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 20916529 is about 4573.4591940893. The cubic root of 20916529 is about 275.5263923122.

The spelling of 20916529 in words is "twenty million, nine hundred sixteen thousand, five hundred twenty-nine".