20949017 has 2 divisors, whose sum is σ = 20949018. Its totient is φ = 20949016.

The previous prime is 20949013. The next prime is 20949023. The reversal of 20949017 is 71094902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15768841 + 5180176 = 3971^2 + 2276^2 .

It is a cyclic number.

It is not a de Polignac number, because 20949017 - 2² = 20949013 is a prime.

It is a super-2 number, since 2×20949017² = 877722626532578, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20949013) 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, 10474508 + 10474509.

It is an arithmetic number, because the mean of its divisors is an integer number (10474509).

Almost surely, 2^20949017 is an apocalyptic number.

It is an amenable number.

20949017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20949017 is an equidigital number, since it uses as much as digits as its factorization.

20949017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 20949017 is about 4577.0096132737. The cubic root of 20949017 is about 275.6689696805.

It can be divided in two parts, 2094 and 9017, that added together give a palindrome (11111).

The spelling of 20949017 in words is "twenty million, nine hundred forty-nine thousand, seventeen".