20280569 has 2 divisors, whose sum is σ = 20280570. Its totient is φ = 20280568.

The previous prime is 20280529. The next prime is 20280577. The reversal of 20280569 is 96508202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17682025 + 2598544 = 4205^2 + 1612^2 .

It is a cyclic number.

It is not a de Polignac number, because 20280569 - 2¹⁶ = 20215033 is a prime.

It is a super-2 number, since 2×20280569² = 822602957927522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20280509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10140284 + 10140285.

It is an arithmetic number, because the mean of its divisors is an integer number (10140285).

Almost surely, 2^20280569 is an apocalyptic number.

It is an amenable number.

20280569 is a deficient number, since it is larger than the sum of its proper divisors (1).

20280569 is an equidigital number, since it uses as much as digits as its factorization.

20280569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20280569 is about 4503.3952746789. The cubic root of 20280569 is about 272.7051744351.

The spelling of 20280569 in words is "twenty million, two hundred eighty thousand, five hundred sixty-nine".