20603287 has 4 divisors (see below), whose sum is σ = 20760696. Its totient is φ = 20445880.

The previous prime is 20603281. The next prime is 20603309. The reversal of 20603287 is 78230602.

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

It is a cyclic number.

It is not a de Polignac number, because 20603287 - 2⁷ = 20603159 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 (20603281) 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 3 ways as a sum of consecutive naturals, for example, 78508 + ... + 78769.

It is an arithmetic number, because the mean of its divisors is an integer number (5190174).

Almost surely, 2^20603287 is an apocalyptic number.

20603287 is a deficient number, since it is larger than the sum of its proper divisors (157409).

20603287 is a wasteful number, since it uses less digits than its factorization.

20603287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157408.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20603287 is about 4539.0843790350. The cubic root of 20603287 is about 274.1440581910.

Adding to 20603287 its reverse (78230602), we get a palindrome (98833889).

The spelling of 20603287 in words is "twenty million, six hundred three thousand, two hundred eighty-seven".