20642125 has 32 divisors (see below), whose sum is σ = 30431232. Its totient is φ = 13680000.

The previous prime is 20642099. The next prime is 20642129. The reversal of 20642125 is 52124602.

It is not a de Polignac number, because 20642125 - 2¹³ = 20633933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20642096 and 20642105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20642129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26745 + ... + 27505.

It is an arithmetic number, because the mean of its divisors is an integer number (950976).

Almost surely, 2^20642125 is an apocalyptic number.

20642125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20642125 is a deficient number, since it is larger than the sum of its proper divisors (9789107).

20642125 is an equidigital number, since it uses as much as digits as its factorization.

20642125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814 (or 804 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20642125 is about 4543.3605403930. The cubic root of 20642125 is about 274.3162074828.

Adding to 20642125 its reverse (52124602), we get a palindrome (72766727).

The spelling of 20642125 in words is "twenty million, six hundred forty-two thousand, one hundred twenty-five".