20235431505 has 16 divisors (see below), whose sum is σ = 33421100544. Its totient is φ = 10444093440.

The previous prime is 20235431497. The next prime is 20235431521. The reversal of 20235431505 is 50513453202.

It is not a de Polignac number, because 20235431505 - 2³ = 20235431497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21758064 + ... + 21758993.

It is an arithmetic number, because the mean of its divisors is an integer number (2088818784).

Almost surely, 2^20235431505 is an apocalyptic number.

It is an amenable number.

20235431505 is a deficient number, since it is larger than the sum of its proper divisors (13185669039).

20235431505 is a wasteful number, since it uses less digits than its factorization.

20235431505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43517096.

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 20235431505 its reverse (50513453202), we get a palindrome (70748884707).

The spelling of 20235431505 in words is "twenty billion, two hundred thirty-five million, four hundred thirty-one thousand, five hundred five".