20344353642 has 12 divisors (see below), whose sum is σ = 44079432930. Its totient is φ = 6781451208.

The previous prime is 20344353641. The next prime is 20344353661. The reversal of 20344353642 is 24635344302.

20344353642 is a `hidden beast` number, since 2 + 0 + 3 + 4 + 4 + 3 + 5 + 3 + 642 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19390841001 + 953512641 = 139251^2 + 30879^2 .

It is a super-2 number, since 2×20344353642² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20344353597 and 20344353606.

It is not an unprimeable number, because it can be changed into a prime (20344353641) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 565120917 + ... + 565120952.

Almost surely, 2^20344353642 is an apocalyptic number.

20344353642 is an abundant number, since it is smaller than the sum of its proper divisors (23735079288).

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

20344353642 is a wasteful number, since it uses less digits than its factorization.

20344353642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130241877 (or 1130241874 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 36.

Adding to 20344353642 its reverse (24635344302), we get a palindrome (44979697944).

It can be divided in two parts, 2034 and 4353642, that added together give a triangular number (4355676 = T₂₉₅₁).

The spelling of 20344353642 in words is "twenty billion, three hundred forty-four million, three hundred fifty-three thousand, six hundred forty-two".