20530016 has 48 divisors (see below), whose sum is σ = 46103904. Its totient is φ = 8914944.

The previous prime is 20529991. The next prime is 20530019. The reversal of 20530016 is 61003502.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a junction number, because it is equal to n+sod(n) for n = 20529976 and 20530003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20530019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5621 + ... + 8523.

It is an arithmetic number, because the mean of its divisors is an integer number (960498).

Almost surely, 2^20530016 is an apocalyptic number.

20530016 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20530016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23051952).

20530016 is an abundant number, since it is smaller than the sum of its proper divisors (25573888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20530016 is a wasteful number, since it uses less digits than its factorization.

20530016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2943 (or 2935 counting only the distinct ones).

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

The square root of 20530016 is about 4531.0060692963. The cubic root of 20530016 is about 273.8186947694.

Adding to 20530016 its reverse (61003502), we get a palindrome (81533518).

The spelling of 20530016 in words is "twenty million, five hundred thirty thousand, sixteen".