20321425 has 6 divisors (see below), whose sum is σ = 25198598. Its totient is φ = 16257120.

The previous prime is 20321423. The next prime is 20321447. The reversal of 20321425 is 52412302.

It can be written as a sum of positive squares in 3 ways, for example, as 242064 + 20079361 = 492^2 + 4481^2 .

It is not a de Polignac number, because 20321425 - 2¹ = 20321423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20321423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 406404 + ... + 406453.

Almost surely, 2^20321425 is an apocalyptic number.

20321425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20321425 is a deficient number, since it is larger than the sum of its proper divisors (4877173).

20321425 is an equidigital number, since it uses as much as digits as its factorization.

20321425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812867 (or 812862 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20321425 is about 4507.9291254411. The cubic root of 20321425 is about 272.8881766840. Note that the first 3 decimals are identical.

Adding to 20321425 its reverse (52412302), we get a palindrome (72733727).

The spelling of 20321425 in words is "twenty million, three hundred twenty-one thousand, four hundred twenty-five".