20450042513531 has 16 divisors (see below), whose sum is σ = 21579785398080. Its totient is φ = 19340367720960.

The previous prime is 20450042513491. The next prime is 20450042513543. The reversal of 20450042513531 is 13531524005402.

It is a cyclic number.

It is not a de Polignac number, because 20450042513531 - 2¹⁰ = 20450042512507 is a prime.

It is a super-2 number, since 2×20450042513531² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20450042513491 and 20450042513500.

It is not an unprimeable number, because it can be changed into a prime (20450042513231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56071841 + ... + 56435373.

It is an arithmetic number, because the mean of its divisors is an integer number (1348736587380).

Almost surely, 2^{20450042513531} is an apocalyptic number.

20450042513531 is a deficient number, since it is larger than the sum of its proper divisors (1129742884549).

20450042513531 is a wasteful number, since it uses less digits than its factorization.

20450042513531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391126.

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 20450042513531 its reverse (13531524005402), we get a palindrome (33981566518933).

The spelling of 20450042513531 in words is "twenty trillion, four hundred fifty billion, forty-two million, five hundred thirteen thousand, five hundred thirty-one".