20716535 has 8 divisors (see below), whose sum is σ = 28411296. Its totient is φ = 14205600.

The previous prime is 20716483. The next prime is 20716541. The reversal of 20716535 is 53561702.

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

It is not a de Polignac number, because 20716535 - 2⁸ = 20716279 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20716498 and 20716507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295916 + ... + 295985.

It is an arithmetic number, because the mean of its divisors is an integer number (3551412).

Almost surely, 2^20716535 is an apocalyptic number.

20716535 is a deficient number, since it is larger than the sum of its proper divisors (7694761).

20716535 is an equidigital number, since it uses as much as digits as its factorization.

20716535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591913.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 20716535 is about 4551.5420463838. The cubic root of 20716535 is about 274.6454273239.

The spelling of 20716535 in words is "twenty million, seven hundred sixteen thousand, five hundred thirty-five".