66020442 has 32 divisors (see below), whose sum is σ = 138903552. Its totient is φ = 20878704.

The previous prime is 66020417. The next prime is 66020447. The reversal of 66020442 is 24402066.

It is not an unprimeable number, because it can be changed into a prime (66020447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15643 + ... + 19409.

It is an arithmetic number, because the mean of its divisors is an integer number (4340736).

Almost surely, 2^66020442 is an apocalyptic number.

66020442 is an abundant number, since it is smaller than the sum of its proper divisors (72883110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66020442 is a wasteful number, since it uses less digits than its factorization.

66020442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3922.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 66020442 is about 8125.2964253620. The cubic root of 66020442 is about 404.1657204971.

The spelling of 66020442 in words is "sixty-six million, twenty thousand, four hundred forty-two".