20725013 has 2 divisors, whose sum is σ = 20725014. Its totient is φ = 20725012.

The previous prime is 20725009. The next prime is 20725037. The reversal of 20725013 is 31052702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19562929 + 1162084 = 4423^2 + 1078^2 .

It is a cyclic number.

It is not a de Polignac number, because 20725013 - 2² = 20725009 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20725813) 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 as a sum of consecutive naturals, namely, 10362506 + 10362507.

It is an arithmetic number, because the mean of its divisors is an integer number (10362507).

Almost surely, 2^20725013 is an apocalyptic number.

It is an amenable number.

20725013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20725013 is an equidigital number, since it uses as much as digits as its factorization.

20725013 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20725013 is about 4552.4732838315. The cubic root of 20725013 is about 274.6828873588.

Adding to 20725013 its reverse (31052702), we get a palindrome (51777715).

The spelling of 20725013 in words is "twenty million, seven hundred twenty-five thousand, thirteen".