20002757 has 2 divisors, whose sum is σ = 20002758. Its totient is φ = 20002756.

The previous prime is 20002739. The next prime is 20002771. The reversal of 20002757 is 75720002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18671041 + 1331716 = 4321^2 + 1154^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20002757 is a prime.

It is a super-2 number, since 2×20002757² = 800220575202098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20002457) 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, 10001378 + 10001379.

It is an arithmetic number, because the mean of its divisors is an integer number (10001379).

Almost surely, 2^20002757 is an apocalyptic number.

It is an amenable number.

20002757 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002757 is an equidigital number, since it uses as much as digits as its factorization.

20002757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 980, while the sum is 23.

The square root of 20002757 is about 4472.4441863482. Note that the first 3 decimals coincide. The cubic root of 20002757 is about 271.4542338354.

Adding to 20002757 its reverse (75720002), we get a palindrome (95722759).

The spelling of 20002757 in words is "twenty million, two thousand, seven hundred fifty-seven".