20716523 has 8 divisors (see below), whose sum is σ = 21986640. Its totient is φ = 19452160.

The previous prime is 20716483. The next prime is 20716541. The reversal of 20716523 is 32561702.

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 20716523 - 2⁶ = 20716459 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20716492 and 20716501.

It is not an unprimeable number, because it can be changed into a prime (20716543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7688 + ... + 10026.

It is an arithmetic number, because the mean of its divisors is an integer number (2748330).

Almost surely, 2^20716523 is an apocalyptic number.

20716523 is a deficient number, since it is larger than the sum of its proper divisors (1270117).

20716523 is a wasteful number, since it uses less digits than its factorization.

20716523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2877.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20716523 is about 4551.5407281491. The cubic root of 20716523 is about 274.6453742947.

The spelling of 20716523 in words is "twenty million, seven hundred sixteen thousand, five hundred twenty-three".