20490707 has 2 divisors, whose sum is σ = 20490708. Its totient is φ = 20490706.

The previous prime is 20490689. The next prime is 20490709. The reversal of 20490707 is 70709402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20490707 - 2⁸ = 20490451 is a prime.

Together with 20490709, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20490707.

It is not a weakly prime, because it can be changed into another prime (20490709) 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, 10245353 + 10245354.

It is an arithmetic number, because the mean of its divisors is an integer number (10245354).

Almost surely, 2^20490707 is an apocalyptic number.

20490707 is a deficient number, since it is larger than the sum of its proper divisors (1).

20490707 is an equidigital number, since it uses as much as digits as its factorization.

20490707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 20490707 is about 4526.6662125675. Note that the first 3 decimals coincide. The cubic root of 20490707 is about 273.6438221005.

The spelling of 20490707 in words is "twenty million, four hundred ninety thousand, seven hundred seven".