20727513 has 6 divisors (see below), whose sum is σ = 29939754. Its totient is φ = 13818336.

The previous prime is 20727503. The next prime is 20727521. The reversal of 20727513 is 31572702.

It can be written as a sum of positive squares in only one way, i.e., 18688329 + 2039184 = 4323^2 + 1428^2 .

It is not a de Polignac number, because 20727513 - 2⁶ = 20727449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20727503) 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 in 5 ways as a sum of consecutive naturals, for example, 1151520 + ... + 1151537.

It is an arithmetic number, because the mean of its divisors is an integer number (4989959).

Almost surely, 2^20727513 is an apocalyptic number.

It is an amenable number.

20727513 is a deficient number, since it is larger than the sum of its proper divisors (9212241).

20727513 is a wasteful number, since it uses less digits than its factorization.

20727513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303063 (or 2303060 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 20727513 is about 4552.7478515727. The cubic root of 20727513 is about 274.6939316560.

The spelling of 20727513 in words is "twenty million, seven hundred twenty-seven thousand, five hundred thirteen".