20520030 has 32 divisors (see below), whose sum is σ = 50396544. Its totient is φ = 5344416.

The previous prime is 20520029. The next prime is 20520041. The reversal of 20520030 is 3002502.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20519988 and 20520015.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6664 + ... + 9243.

It is an arithmetic number, because the mean of its divisors is an integer number (1574892).

Almost surely, 2^20520030 is an apocalyptic number.

20520030 is an abundant number, since it is smaller than the sum of its proper divisors (29876514).

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

20520030 is a wasteful number, since it uses less digits than its factorization.

20520030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15960.

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

The square root of 20520030 is about 4529.9039724921. The cubic root of 20520030 is about 273.7742915414.

Adding to 20520030 its reverse (3002502), we get a palindrome (23522532).

The spelling of 20520030 in words is "twenty million, five hundred twenty thousand, thirty".