20163603 has 8 divisors (see below), whose sum is σ = 27510208. Its totient is φ = 13129704.

The previous prime is 20163593. The next prime is 20163623. The reversal of 20163603 is 30636102.

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

It is not a de Polignac number, because 20163603 - 2¹² = 20159507 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 20163603.

It is not an unprimeable number, because it can be changed into a prime (20163623) 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, 78025 + ... + 78282.

It is an arithmetic number, because the mean of its divisors is an integer number (3438776).

Almost surely, 2^20163603 is an apocalyptic number.

20163603 is a deficient number, since it is larger than the sum of its proper divisors (7346605).

20163603 is a wasteful number, since it uses less digits than its factorization.

20163603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156353.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 20163603 is about 4490.3900721430. The cubic root of 20163603 is about 272.1798973918.

Adding to 20163603 its reverse (30636102), we get a palindrome (50799705).

The spelling of 20163603 in words is "twenty million, one hundred sixty-three thousand, six hundred three".