20452530 has 96 divisors (see below), whose sum is σ = 59769216. Its totient is φ = 4386816.

The previous prime is 20452519. The next prime is 20452559. The reversal of 20452530 is 3525402.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20452497 and 20452506.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60522 + ... + 60858.

It is an arithmetic number, because the mean of its divisors is an integer number (622596).

Almost surely, 2^20452530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20452530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29884608).

20452530 is an abundant number, since it is smaller than the sum of its proper divisors (39316686).

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

20452530 is a wasteful number, since it uses less digits than its factorization.

20452530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20452530 is about 4522.4473462938. The cubic root of 20452530 is about 273.4737711123.

Adding to 20452530 its reverse (3525402), we get a palindrome (23977932).

The spelling of 20452530 in words is "twenty million, four hundred fifty-two thousand, five hundred thirty".