42020669 has 2 divisors, whose sum is σ = 42020670. Its totient is φ = 42020668.

The previous prime is 42020639. The next prime is 42020677. The reversal of 42020669 is 96602024.

42020669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39000025 + 3020644 = 6245^2 + 1738^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42020669 is a prime.

It is a super-2 number, since 2×42020669² = 3531473246415122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42020639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21010334 + 21010335.

It is an arithmetic number, because the mean of its divisors is an integer number (21010335).

Almost surely, 2^42020669 is an apocalyptic number.

It is an amenable number.

42020669 is a deficient number, since it is larger than the sum of its proper divisors (1).

42020669 is an equidigital number, since it uses as much as digits as its factorization.

42020669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 42020669 is about 6482.3351502371. The cubic root of 42020669 is about 347.6596757683.

The spelling of 42020669 in words is "forty-two million, twenty thousand, six hundred sixty-nine".