20343040442 has 16 divisors (see below), whose sum is σ = 31013017992. Its totient is φ = 10006651200.

The previous prime is 20343040433. The next prime is 20343040469. The reversal of 20343040442 is 24404034302.

It can be written as a sum of positive squares in 4 ways, for example, as 20323068481 + 19971961 = 142559^2 + 4469^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 289013 + ... + 352440.

Almost surely, 2^20343040442 is an apocalyptic number.

20343040442 is a deficient number, since it is larger than the sum of its proper divisors (10669977550).

20343040442 is a wasteful number, since it uses less digits than its factorization.

20343040442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641713.

The product of its (nonzero) digits is 9216, while the sum is 26.

Adding to 20343040442 its reverse (24404034302), we get a palindrome (44747074744).

The spelling of 20343040442 in words is "twenty billion, three hundred forty-three million, forty thousand, four hundred forty-two".