42020644 has 12 divisors (see below), whose sum is σ = 73593100. Its totient is φ = 20994048.

The previous prime is 42020639. The next prime is 42020669. The reversal of 42020644 is 44602024.

It can be written as a sum of positive squares in 2 ways, for example, as 24127744 + 17892900 = 4912^2 + 4230^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3172 + ... + 9700.

Almost surely, 2^42020644 is an apocalyptic number.

It is an amenable number.

42020644 is a deficient number, since it is larger than the sum of its proper divisors (31572456).

42020644 is a wasteful number, since it uses less digits than its factorization.

42020644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8142 (or 8140 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 42020644 is about 6482.3332219194. Note that the first 3 decimals coincide. The cubic root of 42020644 is about 347.6596068221.

Adding to 42020644 its reverse (44602024), we get a palindrome (86622668).

The spelling of 42020644 in words is "forty-two million, twenty thousand, six hundred forty-four".