20738569 has 2 divisors, whose sum is σ = 20738570. Its totient is φ = 20738568.

The previous prime is 20738563. The next prime is 20738581. The reversal of 20738569 is 96583702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13104400 + 7634169 = 3620^2 + 2763^2 .

It is a cyclic number.

It is not a de Polignac number, because 20738569 - 2⁹ = 20738057 is a prime.

It is a super-2 number, since 2×20738569² = 860176488335522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20738563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10369284 + 10369285.

It is an arithmetic number, because the mean of its divisors is an integer number (10369285).

Almost surely, 2^20738569 is an apocalyptic number.

It is an amenable number.

20738569 is a deficient number, since it is larger than the sum of its proper divisors (1).

20738569 is an equidigital number, since it uses as much as digits as its factorization.

20738569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 20738569 is about 4553.9619014656. The cubic root of 20738569 is about 274.7427633110.

The spelling of 20738569 in words is "twenty million, seven hundred thirty-eight thousand, five hundred sixty-nine".