20484391 has 2 divisors, whose sum is σ = 20484392. Its totient is φ = 20484390.

The previous prime is 20484319. The next prime is 20484403. The reversal of 20484391 is 19348402.

Together with previous prime (20484319) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20484391 - 2¹³ = 20476199 is a prime.

It is a super-2 number, since 2×20484391² = 839220549281762, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20484691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10242195 + 10242196.

It is an arithmetic number, because the mean of its divisors is an integer number (10242196).

Almost surely, 2^20484391 is an apocalyptic number.

20484391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20484391 is an equidigital number, since it uses as much as digits as its factorization.

20484391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20484391 is about 4525.9685151357. The cubic root of 20484391 is about 273.6157034678.

The spelling of 20484391 in words is "twenty million, four hundred eighty-four thousand, three hundred ninety-one".