20420342330 has 16 divisors (see below), whose sum is σ = 37653119784. Its totient is φ = 7968913920.

The previous prime is 20420342303. The next prime is 20420342363. The reversal of 20420342330 is 3324302402.

It can be written as a sum of positive squares in 4 ways, for example, as 6960398041 + 13459944289 = 83429^2 + 116017^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20420342296 and 20420342305.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24902447 + ... + 24903266.

Almost surely, 2^20420342330 is an apocalyptic number.

20420342330 is a deficient number, since it is larger than the sum of its proper divisors (17232777454).

20420342330 is a wasteful number, since it uses less digits than its factorization.

20420342330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49805761.

The product of its (nonzero) digits is 3456, while the sum is 23.

Adding to 20420342330 its reverse (3324302402), we get a palindrome (23744644732).

The spelling of 20420342330 in words is "twenty billion, four hundred twenty million, three hundred forty-two thousand, three hundred thirty".