20651025 has 24 divisors (see below), whose sum is σ = 34310304. Its totient is φ = 10960000.

The previous prime is 20651021. The next prime is 20651027. The reversal of 20651025 is 52015602.

It is not a de Polignac number, because 20651025 - 2² = 20651021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20650992 and 20651010.

It is not an unprimeable number, because it can be changed into a prime (20651021) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 18277 + ... + 19373.

It is an arithmetic number, because the mean of its divisors is an integer number (1429596).

Almost surely, 2^20651025 is an apocalyptic number.

20651025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20651025 is a deficient number, since it is larger than the sum of its proper divisors (13659279).

20651025 is a wasteful number, since it uses less digits than its factorization.

20651025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361 (or 1356 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 20651025 is about 4544.3398860561. The cubic root of 20651025 is about 274.3556262838.

Adding to 20651025 its reverse (52015602), we get a palindrome (72666627).

The spelling of 20651025 in words is "twenty million, six hundred fifty-one thousand, twenty-five".