20513242145 has 8 divisors (see below), whose sum is σ = 26853698880. Its totient is φ = 14918721520.

The previous prime is 20513242129. The next prime is 20513242153. The reversal of 20513242145 is 54124231502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20513242145 - 2⁴ = 20513242129 is a prime.

It is a super-4 number, since 4×20513242145⁴ (a number of 42 digits) contains 4444 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 186483965 + ... + 186484074.

It is an arithmetic number, because the mean of its divisors is an integer number (3356712360).

Almost surely, 2^20513242145 is an apocalyptic number.

It is an amenable number.

20513242145 is a deficient number, since it is larger than the sum of its proper divisors (6340456735).

20513242145 is a wasteful number, since it uses less digits than its factorization.

20513242145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372968055.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 20513242145 its reverse (54124231502), we get a palindrome (74637473647).

The spelling of 20513242145 in words is "twenty billion, five hundred thirteen million, two hundred forty-two thousand, one hundred forty-five".