20235435551 has 4 divisors (see below), whose sum is σ = 20236036632. Its totient is φ = 20234834472.

The previous prime is 20235435509. The next prime is 20235435593. The reversal of 20235435551 is 15553453202.

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

It is an interprime number because it is at equal distance from previous prime (20235435509) and next prime (20235435593).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20235435551 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 (20235435251) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 246845 + ... + 318438.

It is an arithmetic number, because the mean of its divisors is an integer number (5059009158).

Almost surely, 2^20235435551 is an apocalyptic number.

20235435551 is a deficient number, since it is larger than the sum of its proper divisors (601081).

20235435551 is an equidigital number, since it uses as much as digits as its factorization.

20235435551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601080.

The product of its (nonzero) digits is 90000, while the sum is 35.

Adding to 20235435551 its reverse (15553453202), we get a palindrome (35788888753).

The spelling of 20235435551 in words is "twenty billion, two hundred thirty-five million, four hundred thirty-five thousand, five hundred fifty-one".