20656025 has 18 divisors (see below), whose sum is σ = 27740970. Its totient is φ = 15250560.

The previous prime is 20655997. The next prime is 20656057. The reversal of 20656025 is 52065602.

It is a happy number.

It can be written as a sum of positive squares in 9 ways, for example, as 11095561 + 9560464 = 3331^2 + 3092^2 .

It is not a de Polignac number, because 20656025 - 2¹² = 20651929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20655985 and 20656003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1781 + ... + 6669.

It is an arithmetic number, because the mean of its divisors is an integer number (1541165).

Almost surely, 2^20656025 is an apocalyptic number.

20656025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20656025 is a deficient number, since it is larger than the sum of its proper divisors (7084945).

20656025 is a wasteful number, since it uses less digits than its factorization.

20656025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4925 (or 4907 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20656025 is about 4544.8899876675. The cubic root of 20656025 is about 274.3777667092.

The spelling of 20656025 in words is "twenty million, six hundred fifty-six thousand, twenty-five".