20501713 has 4 divisors (see below), whose sum is σ = 20512948. Its totient is φ = 20490480.

The previous prime is 20501699. The next prime is 20501731. The reversal of 20501713 is 31710502.

It is the 1849-th star number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9690769 + 10810944 = 3113^2 + 3288^2 .

It is a cyclic number.

It is not a de Polignac number, because 20501713 - 2¹³ = 20493521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20501743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2178 + ... + 6763.

It is an arithmetic number, because the mean of its divisors is an integer number (5128237).

Almost surely, 2^20501713 is an apocalyptic number.

It is an amenable number.

20501713 is a deficient number, since it is larger than the sum of its proper divisors (11235).

20501713 is an equidigital number, since it uses as much as digits as its factorization.

20501713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11234.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 20501713 is about 4527.8817343212. The cubic root of 20501713 is about 273.6928066613.

The spelling of 20501713 in words is "twenty million, five hundred one thousand, seven hundred thirteen".