20135420255 has 4 divisors (see below), whose sum is σ = 24162504312. Its totient is φ = 16108336200.

The previous prime is 20135420237. The next prime is 20135420257. The reversal of 20135420255 is 55202453102.

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

It is not a de Polignac number, because 20135420255 - 2²⁸ = 19866984799 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 (20135420257) 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, 2013542021 + ... + 2013542030.

It is an arithmetic number, because the mean of its divisors is an integer number (6040626078).

Almost surely, 2^20135420255 is an apocalyptic number.

20135420255 is a deficient number, since it is larger than the sum of its proper divisors (4027084057).

20135420255 is an equidigital number, since it uses as much as digits as its factorization.

20135420255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4027084056.

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 20135420255 its reverse (55202453102), we get a palindrome (75337873357).

The spelling of 20135420255 in words is "twenty billion, one hundred thirty-five million, four hundred twenty thousand, two hundred fifty-five".