20488321 has 6 divisors (see below), whose sum is σ = 23833410. Its totient is φ = 17561376.

The previous prime is 20488313. The next prime is 20488333. The reversal of 20488321 is 12388402.

It can be written as a sum of positive squares in only one way, i.e., 14554225 + 5934096 = 3815^2 + 2436^2 .

It is not a de Polignac number, because 20488321 - 2³ = 20488313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20488321.

It is not an unprimeable number, because it can be changed into a prime (20488421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 209016 + ... + 209113.

It is an arithmetic number, because the mean of its divisors is an integer number (3972235).

Almost surely, 2^20488321 is an apocalyptic number.

It is an amenable number.

20488321 is a deficient number, since it is larger than the sum of its proper divisors (3345089).

20488321 is an equidigital number, since it uses as much as digits as its factorization.

20488321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418143 (or 418136 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 20488321 is about 4526.4026555312. The cubic root of 20488321 is about 273.6332003830.

The spelling of 20488321 in words is "twenty million, four hundred eighty-eight thousand, three hundred twenty-one".