4020522642 has 20 divisors (see below), whose sum is σ = 9008949246. Its totient is φ = 1340174160.

The previous prime is 4020522563. The next prime is 4020522647. The reversal of 4020522642 is 2462250204.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3868715601 + 151807041 = 62199^2 + 12321^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (4020522647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 12408859 + ... + 12409182.

Almost surely, 2^4020522642 is an apocalyptic number.

4020522642 is an abundant number, since it is smaller than the sum of its proper divisors (4988426604).

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

4020522642 is a wasteful number, since it uses less digits than its factorization.

4020522642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24818055 (or 24818046 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 4020522642 is about 63407.5913593948. The cubic root of 4020522642 is about 1590.1112275340. Note that the first 3 decimals are identical.

Adding to 4020522642 its reverse (2462250204), we get a palindrome (6482772846).

The spelling of 4020522642 in words is "four billion, twenty million, five hundred twenty-two thousand, six hundred forty-two".