20000520 has 80 divisors (see below), whose sum is σ = 67234860. Its totient is φ = 5332608.

The previous prime is 20000507. The next prime is 20000531. The reversal of 20000520 is 2500002.

It can be written as a sum of positive squares in 2 ways, for example, as 16695396 + 3305124 = 4086^2 + 1818^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 154 + ... + 6326.

Almost surely, 2^20000520 is an apocalyptic number.

20000520 is a gapful number since it is divisible by the number (20) 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 20000520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33617430).

20000520 is an abundant number, since it is smaller than the sum of its proper divisors (47234340).

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

20000520 is a wasteful number, since it uses less digits than its factorization.

20000520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6196 (or 6183 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 9.

The square root of 20000520 is about 4472.1940923891. The cubic root of 20000520 is about 271.4441141344. Note that the first 3 decimals are identical.

Adding to 20000520 its reverse (2500002), we get a palindrome (22500522).

The spelling of 20000520 in words is "twenty million, five hundred twenty", and thus it is an aban number.