20716501 has 8 divisors (see below), whose sum is σ = 22357944. Its totient is φ = 19081920.

The previous prime is 20716483. The next prime is 20716541. The reversal of 20716501 is 10561702.

It can be written as a sum of positive squares in 4 ways, for example, as 4900 + 20711601 = 70^2 + 4551^2 .

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

It is not a de Polignac number, because 20716501 - 2⁷ = 20716373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20716541) 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, 5811 + ... + 8671.

It is an arithmetic number, because the mean of its divisors is an integer number (2794743).

Almost surely, 2^20716501 is an apocalyptic number.

It is an amenable number.

20716501 is a deficient number, since it is larger than the sum of its proper divisors (1641443).

20716501 is a wasteful number, since it uses less digits than its factorization.

20716501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3431.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 20716501 is about 4551.5383113844. The cubic root of 20716501 is about 274.6452770743.

The spelling of 20716501 in words is "twenty million, seven hundred sixteen thousand, five hundred one".