20055569 has 2 divisors, whose sum is σ = 20055570. Its totient is φ = 20055568.

The previous prime is 20055547. The next prime is 20055593. The reversal of 20055569 is 96555002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19254544 + 801025 = 4388^2 + 895^2 .

It is a cyclic number.

It is not a de Polignac number, because 20055569 - 2⁸ = 20055313 is a prime.

It is a super-2 number, since 2×20055569² = 804451695827522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20055599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10027784 + 10027785.

It is an arithmetic number, because the mean of its divisors is an integer number (10027785).

Almost surely, 2^20055569 is an apocalyptic number.

It is an amenable number.

20055569 is a deficient number, since it is larger than the sum of its proper divisors (1).

20055569 is an equidigital number, since it uses as much as digits as its factorization.

20055569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 20055569 is about 4478.3444485658. The cubic root of 20055569 is about 271.6929249756.

The spelling of 20055569 in words is "twenty million, fifty-five thousand, five hundred sixty-nine".