20531130 has 32 divisors (see below), whose sum is σ = 50976000. Its totient is φ = 5285952.

The previous prime is 20531107. The next prime is 20531171. The reversal of 20531130 is 3113502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10930 + ... + 12669.

It is an arithmetic number, because the mean of its divisors is an integer number (1593000).

Almost surely, 2^20531130 is an apocalyptic number.

20531130 is an abundant number, since it is smaller than the sum of its proper divisors (30444870).

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

20531130 is a wasteful number, since it uses less digits than its factorization.

20531130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23638.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 20531130 is about 4531.1289983844. The cubic root of 20531130 is about 273.8236473310.

Adding to 20531130 its reverse (3113502), we get a palindrome (23644632).

The spelling of 20531130 in words is "twenty million, five hundred thirty-one thousand, one hundred thirty".