20602513 has 2 divisors, whose sum is σ = 20602514. Its totient is φ = 20602512.

The previous prime is 20602511. The next prime is 20602523. The reversal of 20602513 is 31520602.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19998784 + 603729 = 4472^2 + 777^2 .

It is a cyclic number.

It is not a de Polignac number, because 20602513 - 2¹ = 20602511 is a prime.

Together with 20602511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20602511) 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, 10301256 + 10301257.

It is an arithmetic number, because the mean of its divisors is an integer number (10301257).

Almost surely, 2^20602513 is an apocalyptic number.

It is an amenable number.

20602513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20602513 is an equidigital number, since it uses as much as digits as its factorization.

20602513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20602513 is about 4538.9991187485. Note that the first 3 decimals coincide. The cubic root of 20602513 is about 274.1406252411.

It can be divided in two parts, 20602 and 513, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20602513 in words is "twenty million, six hundred two thousand, five hundred thirteen".