20135243154 has 64 divisors (see below), whose sum is σ = 44173866240. Its totient is φ = 6081143040.

The previous prime is 20135243147. The next prime is 20135243159. The reversal of 20135243154 is 45134253102.

It is not an unprimeable number, because it can be changed into a prime (20135243159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1260264 + ... + 1276140.

It is an arithmetic number, because the mean of its divisors is an integer number (690216660).

Almost surely, 2^20135243154 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20135243154, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22086933120).

20135243154 is an abundant number, since it is smaller than the sum of its proper divisors (24038623086).

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

20135243154 is a wasteful number, since it uses less digits than its factorization.

20135243154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16195.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 20135243154 its reverse (45134253102), we get a palindrome (65269496256).

The spelling of 20135243154 in words is "twenty billion, one hundred thirty-five million, two hundred forty-three thousand, one hundred fifty-four".