20030056531 has 4 divisors (see below), whose sum is σ = 20162706064. Its totient is φ = 19897407000.

The previous prime is 20030056513. The next prime is 20030056547. The reversal of 20030056531 is 13565003002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20030056531 - 2⁵ = 20030056499 is a prime.

It is a super-2 number, since 2×20030056531² (a number of 21 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 = 20030056496 and 20030056505.

It is not an unprimeable number, because it can be changed into a prime (20030056511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66324540 + ... + 66324841.

It is an arithmetic number, because the mean of its divisors is an integer number (5040676516).

Almost surely, 2^20030056531 is an apocalyptic number.

20030056531 is a deficient number, since it is larger than the sum of its proper divisors (132649533).

20030056531 is a wasteful number, since it uses less digits than its factorization.

20030056531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132649532.

The product of its (nonzero) digits is 2700, while the sum is 25.

Adding to 20030056531 its reverse (13565003002), we get a palindrome (33595059533).

The spelling of 20030056531 in words is "twenty billion, thirty million, fifty-six thousand, five hundred thirty-one".