20211025 has 6 divisors (see below), whose sum is σ = 25061702. Its totient is φ = 16168800.

The previous prime is 20211007. The next prime is 20211031. The reversal of 20211025 is 52011202.

It can be written as a sum of positive squares in 3 ways, for example, as 5702544 + 14508481 = 2388^2 + 3809^2 .

It is not a de Polignac number, because 20211025 - 2⁹ = 20210513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20210996 and 20211014.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 404196 + ... + 404245.

Almost surely, 2^20211025 is an apocalyptic number.

20211025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20211025 is a deficient number, since it is larger than the sum of its proper divisors (4850677).

20211025 is an equidigital number, since it uses as much as digits as its factorization.

20211025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808451 (or 808446 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 20211025 is about 4495.6673586910. The cubic root of 20211025 is about 272.3931067995.

Adding to 20211025 its reverse (52011202), we get a palindrome (72222227).

The spelling of 20211025 in words is "twenty million, two hundred eleven thousand, twenty-five".