20956125 has 64 divisors (see below), whose sum is σ = 37739520. Its totient is φ = 10304000.

The previous prime is 20956109. The next prime is 20956129. The reversal of 20956125 is 52165902.

It is a happy number.

It is not a de Polignac number, because 20956125 - 2⁴ = 20956109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20956092 and 20956101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20956129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 445852 + ... + 445898.

It is an arithmetic number, because the mean of its divisors is an integer number (589680).

Almost surely, 2^20956125 is an apocalyptic number.

20956125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20956125 is a deficient number, since it is larger than the sum of its proper divisors (16783395).

20956125 is a wasteful number, since it uses less digits than its factorization.

20956125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 20956125 is about 4577.7860369397. The cubic root of 20956125 is about 275.7001443090.

The spelling of 20956125 in words is "twenty million, nine hundred fifty-six thousand, one hundred twenty-five".