20025391 has 2 divisors, whose sum is σ = 20025392. Its totient is φ = 20025390.

The previous prime is 20025353. The next prime is 20025403. The reversal of 20025391 is 19352002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20025391 - 2¹¹ = 20023343 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20025311) 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, 10012695 + 10012696.

It is an arithmetic number, because the mean of its divisors is an integer number (10012696).

Almost surely, 2^20025391 is an apocalyptic number.

20025391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20025391 is an equidigital number, since it uses as much as digits as its factorization.

20025391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 20025391 is about 4474.9738546722. The cubic root of 20025391 is about 271.5565827123.

Adding to 20025391 its reverse (19352002), we get a palindrome (39377393).

The spelling of 20025391 in words is "twenty million, twenty-five thousand, three hundred ninety-one".