20235120505 has 16 divisors (see below), whose sum is σ = 24384718224. Its totient is φ = 16119792640.

The previous prime is 20235120497. The next prime is 20235120509. The reversal of 20235120505 is 50502153202.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 451010169 + 19784110336 = 21237^2 + 140656^2 .

It is not a de Polignac number, because 20235120505 - 2³ = 20235120497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20235120505.

It is not an unprimeable number, because it can be changed into a prime (20235120509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2633349 + ... + 2641021.

It is an arithmetic number, because the mean of its divisors is an integer number (1524044889).

Almost surely, 2^20235120505 is an apocalyptic number.

It is an amenable number.

20235120505 is a deficient number, since it is larger than the sum of its proper divisors (4149597719).

20235120505 is a wasteful number, since it uses less digits than its factorization.

20235120505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9836.

The product of its (nonzero) digits is 3000, while the sum is 25.

Adding to 20235120505 its reverse (50502153202), we get a palindrome (70737273707).

The spelling of 20235120505 in words is "twenty billion, two hundred thirty-five million, one hundred twenty thousand, five hundred five".