20503717 has 24 divisors (see below), whose sum is σ = 24771096. Its totient is φ = 16809984.

The previous prime is 20503709. The next prime is 20503753. The reversal of 20503717 is 71730502.

It can be written as a sum of positive squares in 4 ways, for example, as 8014561 + 12489156 = 2831^2 + 3534^2 .

It is not a de Polignac number, because 20503717 - 2³ = 20503709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20503691 and 20503700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20503117) 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 23 ways as a sum of consecutive naturals, for example, 79653 + ... + 79909.

It is an arithmetic number, because the mean of its divisors is an integer number (1032129).

Almost surely, 2^20503717 is an apocalyptic number.

It is an amenable number.

20503717 is a deficient number, since it is larger than the sum of its proper divisors (4267379).

20503717 is a wasteful number, since it uses less digits than its factorization.

20503717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 20503717 is about 4528.1030244463. The cubic root of 20503717 is about 273.7017240058.

The spelling of 20503717 in words is "twenty million, five hundred three thousand, seven hundred seventeen".