42020099 has 4 divisors (see below), whose sum is σ = 45840120. Its totient is φ = 38200080.

The previous prime is 42020093. The next prime is 42020131. The reversal of 42020099 is 99002024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42020099 - 2⁸ = 42019843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42020093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1909994 + ... + 1910015.

It is an arithmetic number, because the mean of its divisors is an integer number (11460030).

Almost surely, 2^42020099 is an apocalyptic number.

42020099 is a deficient number, since it is larger than the sum of its proper divisors (3820021).

42020099 is a wasteful number, since it uses less digits than its factorization.

42020099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3820020.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 42020099 is about 6482.2911844501. The cubic root of 42020099 is about 347.6581037886.

The spelling of 42020099 in words is "forty-two million, twenty thousand, ninety-nine".