20903071 has 16 divisors (see below), whose sum is σ = 24671808. Its totient is φ = 17337600.

The previous prime is 20903027. The next prime is 20903089. The reversal of 20903071 is 17030902.

It is not a de Polignac number, because 20903071 - 2⁷ = 20902943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20903371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49441 + ... + 49861.

It is an arithmetic number, because the mean of its divisors is an integer number (1541988).

Almost surely, 2^20903071 is an apocalyptic number.

20903071 is a deficient number, since it is larger than the sum of its proper divisors (3768737).

20903071 is a wasteful number, since it uses less digits than its factorization.

20903071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 20903071 is about 4571.9876421530. The cubic root of 20903071 is about 275.4672870668.

Adding to 20903071 its reverse (17030902), we get a palindrome (37933973).

The spelling of 20903071 in words is "twenty million, nine hundred three thousand, seventy-one".