20375569 has 2 divisors, whose sum is σ = 20375570. Its totient is φ = 20375568.

The previous prime is 20375527. The next prime is 20375573. The reversal of 20375569 is 96557302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18593344 + 1782225 = 4312^2 + 1335^2 .

It is a cyclic number.

It is not a de Polignac number, because 20375569 - 2⁷ = 20375441 is a prime.

It is a super-2 number, since 2×20375569² = 830327624147522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20375519) 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, 10187784 + 10187785.

It is an arithmetic number, because the mean of its divisors is an integer number (10187785).

Almost surely, 2^20375569 is an apocalyptic number.

It is an amenable number.

20375569 is a deficient number, since it is larger than the sum of its proper divisors (1).

20375569 is an equidigital number, since it uses as much as digits as its factorization.

20375569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56700, while the sum is 37.

The square root of 20375569 is about 4513.9305488676. The cubic root of 20375569 is about 273.1303210305.

The spelling of 20375569 in words is "twenty million, three hundred seventy-five thousand, five hundred sixty-nine".