20752817 has 2 divisors, whose sum is σ = 20752818. Its totient is φ = 20752816.

The previous prime is 20752811. The next prime is 20752829. The reversal of 20752817 is 71825702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15295921 + 5456896 = 3911^2 + 2336^2 .

It is a cyclic number.

It is not a de Polignac number, because 20752817 - 2²² = 16558513 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20752811) 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 as a sum of consecutive naturals, namely, 10376408 + 10376409.

It is an arithmetic number, because the mean of its divisors is an integer number (10376409).

Almost surely, 2^20752817 is an apocalyptic number.

It is an amenable number.

20752817 is a deficient number, since it is larger than the sum of its proper divisors (1).

20752817 is an equidigital number, since it uses as much as digits as its factorization.

20752817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 20752817 is about 4555.5259849989. The cubic root of 20752817 is about 274.8056676635.

The spelling of 20752817 in words is "twenty million, seven hundred fifty-two thousand, eight hundred seventeen".