20343303842 has 4 divisors (see below), whose sum is σ = 30514955766. Its totient is φ = 10171651920.

The previous prime is 20343303829. The next prime is 20343303847. The reversal of 20343303842 is 24830334302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13312313641 + 7030990201 = 115379^2 + 83851^2 .

It is a super-2 number, since 2×20343303842² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20343303799 and 20343303808.

It is not an unprimeable number, because it can be changed into a prime (20343303847) 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 as a sum of consecutive naturals, namely, 5085825959 + ... + 5085825962.

Almost surely, 2^20343303842 is an apocalyptic number.

20343303842 is a deficient number, since it is larger than the sum of its proper divisors (10171651924).

20343303842 is a wasteful number, since it uses less digits than its factorization.

20343303842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10171651923.

The product of its (nonzero) digits is 41472, while the sum is 32.

The spelling of 20343303842 in words is "twenty billion, three hundred forty-three million, three hundred three thousand, eight hundred forty-two".