20513540415354 has 128 divisors (see below), whose sum is σ = 50665774233600. Its totient is φ = 5515552482048.

The previous prime is 20513540415341. The next prime is 20513540415391. The reversal of 20513540415354 is 45351404531502.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 317185729 + ... + 317250395.

It is an arithmetic number, because the mean of its divisors is an integer number (395826361200).

Almost surely, 2^{20513540415354} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20513540415354, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25332887116800).

20513540415354 is an abundant number, since it is smaller than the sum of its proper divisors (30152233818246).

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

20513540415354 is a wasteful number, since it uses less digits than its factorization.

20513540415354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73777 (or 73763 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 42.

Adding to 20513540415354 its reverse (45351404531502), we get a palindrome (65864944946856).

The spelling of 20513540415354 in words is "twenty trillion, five hundred thirteen billion, five hundred forty million, four hundred fifteen thousand, three hundred fifty-four".