20201340442 has 16 divisors (see below), whose sum is σ = 30573475272. Its totient is φ = 10010551360.

The previous prime is 20201340409. The next prime is 20201340469. The reversal of 20201340442 is 24404310202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17942334601 + 2259005841 = 133949^2 + 47529^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17592 + ... + 201772.

Almost surely, 2^20201340442 is an apocalyptic number.

20201340442 is a deficient number, since it is larger than the sum of its proper divisors (10372134830).

20201340442 is a wasteful number, since it uses less digits than its factorization.

20201340442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184673.

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

Adding to 20201340442 its reverse (24404310202), we get a palindrome (44605650644).

The spelling of 20201340442 in words is "twenty billion, two hundred one million, three hundred forty thousand, four hundred forty-two".