20813025 has 24 divisors (see below), whose sum is σ = 34551360. Its totient is φ = 11055040.

The previous prime is 20813021. The next prime is 20813033. The reversal of 20813025 is 52031802.

It is not a de Polignac number, because 20813025 - 2² = 20813021 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20812992 and 20813010.

It is not an unprimeable number, because it can be changed into a prime (20813021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26539 + ... + 27311.

It is an arithmetic number, because the mean of its divisors is an integer number (1439640).

Almost surely, 2^20813025 is an apocalyptic number.

20813025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20813025 is a deficient number, since it is larger than the sum of its proper divisors (13738335).

20813025 is a wasteful number, since it uses less digits than its factorization.

20813025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20813025 is about 4562.1294370064. The cubic root of 20813025 is about 275.0711661546.

Adding to 20813025 its reverse (52031802), we get a palindrome (72844827).

The spelling of 20813025 in words is "twenty million, eight hundred thirteen thousand, twenty-five".