20850825 has 24 divisors (see below), whose sum is σ = 34694208. Its totient is φ = 11049280.

The previous prime is 20850803. The next prime is 20850833. The reversal of 20850825 is 52805802.

It is not a de Polignac number, because 20850825 - 2⁵ = 20850793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20850792 and 20850801.

It is an unprimeable number.

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, 12172 + ... + 13778.

It is an arithmetic number, because the mean of its divisors is an integer number (1445592).

Almost surely, 2^20850825 is an apocalyptic number.

20850825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20850825 is a deficient number, since it is larger than the sum of its proper divisors (13843383).

20850825 is a wasteful number, since it uses less digits than its factorization.

20850825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793 (or 1788 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 20850825 is about 4566.2703599327. The cubic root of 20850825 is about 275.2375908136.

The spelling of 20850825 in words is "twenty million, eight hundred fifty thousand, eight hundred twenty-five".