20425397 has 2 divisors, whose sum is σ = 20425398. Its totient is φ = 20425396.

The previous prime is 20425343. The next prime is 20425417. The reversal of 20425397 is 79352402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14205361 + 6220036 = 3769^2 + 2494^2 .

It is a cyclic number.

It is not a de Polignac number, because 20425397 - 2⁶ = 20425333 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 (20425597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212698 + 10212699.

It is an arithmetic number, because the mean of its divisors is an integer number (10212699).

Almost surely, 2^20425397 is an apocalyptic number.

It is an amenable number.

20425397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20425397 is an equidigital number, since it uses as much as digits as its factorization.

20425397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20425397 is about 4519.4465369114. The cubic root of 20425397 is about 273.3527844906.

Adding to 20425397 its reverse (79352402), we get a palindrome (99777799).

The spelling of 20425397 in words is "twenty million, four hundred twenty-five thousand, three hundred ninety-seven".