42020245 has 8 divisors (see below), whose sum is σ = 51597216. Its totient is φ = 32834256.

The previous prime is 42020233. The next prime is 42020249. The reversal of 42020245 is 54202024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42020245 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42020249) 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 in 7 ways as a sum of consecutive naturals, for example, 97507 + ... + 97936.

It is an arithmetic number, because the mean of its divisors is an integer number (6449652).

Almost surely, 2^42020245 is an apocalyptic number.

It is an amenable number.

42020245 is a deficient number, since it is larger than the sum of its proper divisors (9576971).

42020245 is a wasteful number, since it uses less digits than its factorization.

42020245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195491.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 42020245 is about 6482.3024458907. The cubic root of 42020245 is about 347.6585064374.

Adding to 42020245 its reverse (54202024), we get a palindrome (96222269).

The spelling of 42020245 in words is "forty-two million, twenty thousand, two hundred forty-five".