20742625 has 8 divisors (see below), whose sum is σ = 25886952. Its totient is φ = 16594000.

The previous prime is 20742593. The next prime is 20742637. The reversal of 20742625 is 52624702.

It can be written as a sum of positive squares in 4 ways, for example, as 2798929 + 17943696 = 1673^2 + 4236^2 .

It is not a de Polignac number, because 20742625 - 2⁵ = 20742593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20742593 and 20742602.

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 7 ways as a sum of consecutive naturals, for example, 82846 + ... + 83095.

It is an arithmetic number, because the mean of its divisors is an integer number (3235869).

Almost surely, 2^20742625 is an apocalyptic number.

20742625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20742625 is a deficient number, since it is larger than the sum of its proper divisors (5144327).

20742625 is an equidigital number, since it uses as much as digits as its factorization.

20742625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165956 (or 165946 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 20742625 is about 4554.4072062125. The cubic root of 20742625 is about 274.7606733222.

The spelling of 20742625 in words is "twenty million, seven hundred forty-two thousand, six hundred twenty-five".