20053530 has 96 divisors (see below), whose sum is σ = 60278400. Its totient is φ = 4530816.

The previous prime is 20053513. The next prime is 20053541. The reversal of 20053530 is 3535002.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 87456 + ... + 87684.

It is an arithmetic number, because the mean of its divisors is an integer number (627900).

Almost surely, 2^20053530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20053530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30139200).

20053530 is an abundant number, since it is smaller than the sum of its proper divisors (40224870).

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

20053530 is a wasteful number, since it uses less digits than its factorization.

20053530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 18.

The square root of 20053530 is about 4478.1167916882. The cubic root of 20053530 is about 271.6837172147.

Adding to 20053530 its reverse (3535002), we get a palindrome (23588532).

The spelling of 20053530 in words is "twenty million, fifty-three thousand, five hundred thirty".