20016530 has 8 divisors (see below), whose sum is σ = 36029772. Its totient is φ = 8006608.

The previous prime is 20016523. The next prime is 20016539. The reversal of 20016530 is 3561002.

It can be written as a sum of positive squares in 2 ways, for example, as 19175641 + 840889 = 4379^2 + 917^2 .

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

It is a super-2 number, since 2×20016530² = 801322946481800, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20016499 and 20016508.

It is not an unprimeable number, because it can be changed into a prime (20016539) 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, 1000817 + ... + 1000836.

Almost surely, 2^20016530 is an apocalyptic number.

20016530 is a deficient number, since it is larger than the sum of its proper divisors (16013242).

20016530 is a wasteful number, since it uses less digits than its factorization.

20016530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001660.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 20016530 is about 4473.9836834749. The cubic root of 20016530 is about 271.5165232718.

Adding to 20016530 its reverse (3561002), we get a palindrome (23577532).

The spelling of 20016530 in words is "twenty million, sixteen thousand, five hundred thirty".