20030520 has 64 divisors (see below), whose sum is σ = 60963840. Its totient is φ = 5264000.

The previous prime is 20030519. The next prime is 20030551. The reversal of 20030520 is 2503002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20030496 and 20030505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7345 + ... + 9695.

It is an arithmetic number, because the mean of its divisors is an integer number (952560).

Almost surely, 2^20030520 is an apocalyptic number.

20030520 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 20030520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30481920).

20030520 is an abundant number, since it is smaller than the sum of its proper divisors (40933320).

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

20030520 is a wasteful number, since it uses less digits than its factorization.

20030520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2436 (or 2432 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 12.

The square root of 20030520 is about 4475.5468939561. The cubic root of 20030520 is about 271.5797648617.

Adding to 20030520 its reverse (2503002), we get a palindrome (22533522).

The spelling of 20030520 in words is "twenty million, thirty thousand, five hundred twenty".