135240020 has 12 divisors (see below), whose sum is σ = 284004084. Its totient is φ = 54096000.

The previous prime is 135240013. The next prime is 135240029. The reversal of 135240020 is 20042531.

135240020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 57729604 + 77510416 = 7598^2 + 8804^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135240029) 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, 3380981 + ... + 3381020.

It is an arithmetic number, because the mean of its divisors is an integer number (23667007).

Almost surely, 2^135240020 is an apocalyptic number.

135240020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135240020 is an abundant number, since it is smaller than the sum of its proper divisors (148764064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135240020 is a wasteful number, since it uses less digits than its factorization.

135240020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6762010 (or 6762008 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 135240020 is about 11629.2742679842. The cubic root of 135240020 is about 513.2966250620.

Adding to 135240020 its reverse (20042531), we get a palindrome (155282551).

The spelling of 135240020 in words is "one hundred thirty-five million, two hundred forty thousand, twenty".