20751825 has 24 divisors (see below), whose sum is σ = 34470016. Its totient is φ = 11016000.

The previous prime is 20751823. The next prime is 20751833. The reversal of 20751825 is 52815702.

It is not a de Polignac number, because 20751825 - 2¹ = 20751823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20751792 and 20751801.

It is not an unprimeable number, because it can be changed into a prime (20751823) 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, 19815 + ... + 20835.

Almost surely, 2^20751825 is an apocalyptic number.

20751825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20751825 is a deficient number, since it is larger than the sum of its proper divisors (13718191).

20751825 is a wasteful number, since it uses less digits than its factorization.

20751825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305 (or 1300 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 20751825 is about 4555.4171049422. The cubic root of 20751825 is about 274.8012889557.

The spelling of 20751825 in words is "twenty million, seven hundred fifty-one thousand, eight hundred twenty-five".