20517133 has 24 divisors (see below), whose sum is σ = 26557440. Its totient is φ = 15694560.

The previous prime is 20517121. The next prime is 20517157. The reversal of 20517133 is 33171502.

It is not a de Polignac number, because 20517133 - 2¹³ = 20508941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20517163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19228 + ... + 20266.

It is an arithmetic number, because the mean of its divisors is an integer number (1106560).

Almost surely, 2^20517133 is an apocalyptic number.

It is an amenable number.

20517133 is a deficient number, since it is larger than the sum of its proper divisors (6040307).

20517133 is a wasteful number, since it uses less digits than its factorization.

20517133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097 (or 1090 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 20517133 is about 4529.5841972525. The cubic root of 20517133 is about 273.7614071962.

Adding to 20517133 its reverse (33171502), we get a palindrome (53688635).

The spelling of 20517133 in words is "twenty million, five hundred seventeen thousand, one hundred thirty-three".