20130453531 has 16 divisors (see below), whose sum is σ = 29872540320. Its totient is φ = 13397961600.

The previous prime is 20130453527. The next prime is 20130453547. The reversal of 20130453531 is 13535403102.

20130453531 is a `hidden beast` number, since 2 + 0 + 1 + 304 + 5 + 353 + 1 = 666.

It is not a de Polignac number, because 20130453531 - 2² = 20130453527 is a prime.

It is a super-2 number, since 2×20130453531² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20130453495 and 20130453504.

It is not an unprimeable number, because it can be changed into a prime (20130453571) 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, 604050 + ... + 636503.

It is an arithmetic number, because the mean of its divisors is an integer number (1867033770).

Almost surely, 2^20130453531 is an apocalyptic number.

20130453531 is a deficient number, since it is larger than the sum of its proper divisors (9742086789).

20130453531 is a wasteful number, since it uses less digits than its factorization.

20130453531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241163 (or 1241157 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 20130453531 its reverse (13535403102), we get a palindrome (33665856633).

The spelling of 20130453531 in words is "twenty billion, one hundred thirty million, four hundred fifty-three thousand, five hundred thirty-one".