20425291 has 2 divisors, whose sum is σ = 20425292. Its totient is φ = 20425290.

The previous prime is 20425289. The next prime is 20425303. The reversal of 20425291 is 19252402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20425291 - 2¹ = 20425289 is a prime.

Together with 20425289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20425231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212645 + 10212646.

It is an arithmetic number, because the mean of its divisors is an integer number (10212646).

Almost surely, 2^20425291 is an apocalyptic number.

20425291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20425291 is an equidigital number, since it uses as much as digits as its factorization.

20425291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20425291 is about 4519.4348097965. The cubic root of 20425291 is about 273.3523116243.

Adding to 20425291 its reverse (19252402), we get a palindrome (39677693).

Subtracting from 20425291 its reverse (19252402), we obtain a square (1172889 = 1083²).

The spelling of 20425291 in words is "twenty million, four hundred twenty-five thousand, two hundred ninety-one".