20520020 has 24 divisors (see below), whose sum is σ = 45627624. Its totient is φ = 7725056.

The previous prime is 20519977. The next prime is 20520029. The reversal of 20520020 is 2002502.

It can be written as a sum of positive squares in 4 ways, for example, as 770884 + 19749136 = 878^2 + 4444^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20519983 and 20520010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29837 + ... + 30516.

It is an arithmetic number, because the mean of its divisors is an integer number (1901151).

Almost surely, 2^20520020 is an apocalyptic number.

20520020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20520020 is an abundant number, since it is smaller than the sum of its proper divisors (25107604).

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

20520020 is a wasteful number, since it uses less digits than its factorization.

20520020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60379 (or 60377 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 11.

The square root of 20520020 is about 4529.9028687158. The cubic root of 20520020 is about 273.7742470687.

Adding to 20520020 its reverse (2002502), we get a palindrome (22522522).

The spelling of 20520020 in words is "twenty million, five hundred twenty thousand, twenty".