42020019 has 8 divisors (see below), whose sum is σ = 62251920. Its totient is φ = 28013328.

The previous prime is 42020003. The next prime is 42020023. The reversal of 42020019 is 91002024.

It is not a de Polignac number, because 42020019 - 2⁴ = 42020003 is a prime.

It is a super-2 number, since 2×42020019² = 3531363993520722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42019983 and 42020010.

It is not an unprimeable number, because it can be changed into a prime (42020029) 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, 778122 + ... + 778175.

It is an arithmetic number, because the mean of its divisors is an integer number (7781490).

Almost surely, 2^42020019 is an apocalyptic number.

42020019 is a deficient number, since it is larger than the sum of its proper divisors (20231901).

42020019 is a wasteful number, since it uses less digits than its factorization.

42020019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1556306 (or 1556300 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 42020019 is about 6482.2850137895. The cubic root of 42020019 is about 347.6578831588.

The spelling of 42020019 in words is "forty-two million, twenty thousand, nineteen".