20435340133 has 4 divisors (see below), whose sum is σ = 22007289388. Its totient is φ = 18863390880.

The previous prime is 20435340113. The next prime is 20435340139. The reversal of 20435340133 is 33104353402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3230558244 + 17204781889 = 56838^2 + 131167^2 .

It is a cyclic number.

It is not a de Polignac number, because 20435340133 - 2²¹ = 20433242981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20435340139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785974608 + ... + 785974633.

It is an arithmetic number, because the mean of its divisors is an integer number (5501822347).

Almost surely, 2^20435340133 is an apocalyptic number.

It is an amenable number.

20435340133 is a deficient number, since it is larger than the sum of its proper divisors (1571949255).

20435340133 is a wasteful number, since it uses less digits than its factorization.

20435340133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571949254.

The product of its (nonzero) digits is 12960, while the sum is 28.

Adding to 20435340133 its reverse (33104353402), we get a palindrome (53539693535).

The spelling of 20435340133 in words is "twenty billion, four hundred thirty-five million, three hundred forty thousand, one hundred thirty-three".