20620669 has 2 divisors, whose sum is σ = 20620670. Its totient is φ = 20620668.

The previous prime is 20620667. The next prime is 20620679. The reversal of 20620669 is 96602602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20593444 + 27225 = 4538^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 20620669 - 2¹ = 20620667 is a prime.

It is a super-2 number, since 2×20620669² = 850423980015122, which contains 22 as substring.

Together with 20620667, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20620669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20620667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310334 + 10310335.

It is an arithmetic number, because the mean of its divisors is an integer number (10310335).

Almost surely, 2^20620669 is an apocalyptic number.

It is an amenable number.

20620669 is a deficient number, since it is larger than the sum of its proper divisors (1).

20620669 is an equidigital number, since it uses as much as digits as its factorization.

20620669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20620669 is about 4540.9986787049. The cubic root of 20620669 is about 274.2211305630.

The spelling of 20620669 in words is "twenty million, six hundred twenty thousand, six hundred sixty-nine".