20425138237447 has 2 divisors, whose sum is σ = 20425138237448. Its totient is φ = 20425138237446.

The previous prime is 20425138237411. The next prime is 20425138237459. The reversal of 20425138237447 is 74473283152402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20425138237447 - 2⁷ = 20425138237319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20425138237394 and 20425138237403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20425138237477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212569118723 + 10212569118724.

It is an arithmetic number, because the mean of its divisors is an integer number (10212569118724).

Almost surely, 2^{20425138237447} is an apocalyptic number.

20425138237447 is a deficient number, since it is larger than the sum of its proper divisors (1).

20425138237447 is an equidigital number, since it uses as much as digits as its factorization.

20425138237447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9031680, while the sum is 52.

The spelling of 20425138237447 in words is "twenty trillion, four hundred twenty-five billion, one hundred thirty-eight million, two hundred thirty-seven thousand, four hundred forty-seven".