20492513 has 2 divisors, whose sum is σ = 20492514. Its totient is φ = 20492512.

The previous prime is 20492509. The next prime is 20492543. The reversal of 20492513 is 31529402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18731584 + 1760929 = 4328^2 + 1327^2 .

It is a cyclic number.

It is not a de Polignac number, because 20492513 - 2² = 20492509 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20492543) by changing a digit.

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 as a sum of consecutive naturals, namely, 10246256 + 10246257.

It is an arithmetic number, because the mean of its divisors is an integer number (10246257).

Almost surely, 2^20492513 is an apocalyptic number.

It is an amenable number.

20492513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20492513 is an equidigital number, since it uses as much as digits as its factorization.

20492513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20492513 is about 4526.8656927282. The cubic root of 20492513 is about 273.6518612932.

The spelling of 20492513 in words is "twenty million, four hundred ninety-two thousand, five hundred thirteen".