20203520017 has 4 divisors (see below), whose sum is σ = 20206831140. Its totient is φ = 20200208896.

The previous prime is 20203519991. The next prime is 20203520041. The reversal of 20203520017 is 71002530202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7049953296 + 13153566721 = 83964^2 + 114689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20203520017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20203520017.

It is not an unprimeable number, because it can be changed into a prime (20203520047) 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, 1646392 + ... + 1658617.

It is an arithmetic number, because the mean of its divisors is an integer number (5051707785).

Almost surely, 2^20203520017 is an apocalyptic number.

It is an amenable number.

20203520017 is a deficient number, since it is larger than the sum of its proper divisors (3311123).

20203520017 is an equidigital number, since it uses as much as digits as its factorization.

20203520017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3311122.

The product of its (nonzero) digits is 840, while the sum is 22.

The spelling of 20203520017 in words is "twenty billion, two hundred three million, five hundred twenty thousand, seventeen".