20321130 has 16 divisors (see below), whose sum is σ = 48770784. Its totient is φ = 5418960.

The previous prime is 20321087. The next prime is 20321131. The reversal of 20321130 is 3112302.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20321131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338656 + ... + 338715.

It is an arithmetic number, because the mean of its divisors is an integer number (3048174).

Almost surely, 2^20321130 is an apocalyptic number.

20321130 is an abundant number, since it is smaller than the sum of its proper divisors (28449654).

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

20321130 is a wasteful number, since it uses less digits than its factorization.

20321130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677381.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 20321130 is about 4507.8964051983. The cubic root of 20321130 is about 272.8868561992.

Adding to 20321130 its reverse (3112302), we get a palindrome (23433432).

The spelling of 20321130 in words is "twenty million, three hundred twenty-one thousand, one hundred thirty".