20525130 has 64 divisors (see below), whose sum is σ = 57628800. Its totient is φ = 5184000.

The previous prime is 20525129. The next prime is 20525159. The reversal of 20525130 is 3152502.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 3130 + ... + 7130.

It is an arithmetic number, because the mean of its divisors is an integer number (900450).

Almost surely, 2^20525130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20525130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28814400).

20525130 is an abundant number, since it is smaller than the sum of its proper divisors (37103670).

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

20525130 is a wasteful number, since it uses less digits than its factorization.

20525130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4036 (or 4030 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20525130 is about 4530.4668633597. The cubic root of 20525130 is about 273.7969707354.

Adding to 20525130 its reverse (3152502), we get a palindrome (23677632).

The spelling of 20525130 in words is "twenty million, five hundred twenty-five thousand, one hundred thirty".