20730125 has 16 divisors (see below), whose sum is σ = 27863472. Its totient is φ = 15307200.

The previous prime is 20730119. The next prime is 20730131. The reversal of 20730125 is 52103702.

It is an interprime number because it is at equal distance from previous prime (20730119) and next prime (20730131).

It can be written as a sum of positive squares in 8 ways, for example, as 9853321 + 10876804 = 3139^2 + 3298^2 .

It is not a de Polignac number, because 20730125 - 2⁴ = 20730109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20730097 and 20730106.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 4754 + ... + 8003.

It is an arithmetic number, because the mean of its divisors is an integer number (1741467).

Almost surely, 2^20730125 is an apocalyptic number.

20730125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20730125 is a deficient number, since it is larger than the sum of its proper divisors (7133347).

20730125 is a wasteful number, since it uses less digits than its factorization.

20730125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12785 (or 12775 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 20730125 is about 4553.0347022618. The cubic root of 20730125 is about 274.7054697891.

Adding to 20730125 its reverse (52103702), we get a palindrome (72833827).

The spelling of 20730125 in words is "twenty million, seven hundred thirty thousand, one hundred twenty-five".