20542507 has 2 divisors, whose sum is σ = 20542508. Its totient is φ = 20542506.

The previous prime is 20542499. The next prime is 20542513. The reversal of 20542507 is 70524502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20542507 - 2³ = 20542499 is a prime.

It is not a weakly prime, because it can be changed into another prime (20522507) 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, 10271253 + 10271254.

It is an arithmetic number, because the mean of its divisors is an integer number (10271254).

Almost surely, 2^20542507 is an apocalyptic number.

20542507 is a deficient number, since it is larger than the sum of its proper divisors (1).

20542507 is an equidigital number, since it uses as much as digits as its factorization.

20542507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 20542507 is about 4532.3842511420. The cubic root of 20542507 is about 273.8742163350.

The spelling of 20542507 in words is "twenty million, five hundred forty-two thousand, five hundred seven".