20488231 has 2 divisors, whose sum is σ = 20488232. Its totient is φ = 20488230.

The previous prime is 20488229. The next prime is 20488291. The reversal of 20488231 is 13288402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20488231 - 2¹ = 20488229 is a prime.

It is a super-2 number, since 2×20488231² = 839535219018722, which contains 22 as substring.

Together with 20488229, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20488231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20488201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10244115 + 10244116.

It is an arithmetic number, because the mean of its divisors is an integer number (10244116).

Almost surely, 2^20488231 is an apocalyptic number.

20488231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20488231 is an equidigital number, since it uses as much as digits as its factorization.

20488231 is an evil number, because the sum of its binary digits is even.

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

The square root of 20488231 is about 4526.3927138506. The cubic root of 20488231 is about 273.6327997153.

The spelling of 20488231 in words is "twenty million, four hundred eighty-eight thousand, two hundred thirty-one".