42020666 has 8 divisors (see below), whose sum is σ = 66348480. Its totient is φ = 19904508.

The previous prime is 42020639. The next prime is 42020669. The reversal of 42020666 is 66602024.

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

It is not an unprimeable number, because it can be changed into a prime (42020669) 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, 552866 + ... + 552941.

It is an arithmetic number, because the mean of its divisors is an integer number (8293560).

Almost surely, 2^42020666 is an apocalyptic number.

42020666 is a deficient number, since it is larger than the sum of its proper divisors (24327814).

42020666 is a wasteful number, since it uses less digits than its factorization.

42020666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105828.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 42020666 is about 6482.3349188390. The cubic root of 42020666 is about 347.6596674947.

The spelling of 42020666 in words is "forty-two million, twenty thousand, six hundred sixty-six".