20508707 has 2 divisors, whose sum is σ = 20508708. Its totient is φ = 20508706.

The previous prime is 20508703. The next prime is 20508731. The reversal of 20508707 is 70780502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20508707 - 2² = 20508703 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20508707.

It is not a weakly prime, because it can be changed into another prime (20508703) 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, 10254353 + 10254354.

It is an arithmetic number, because the mean of its divisors is an integer number (10254354).

Almost surely, 2^20508707 is an apocalyptic number.

20508707 is a deficient number, since it is larger than the sum of its proper divisors (1).

20508707 is an equidigital number, since it uses as much as digits as its factorization.

20508707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 20508707 is about 4528.6539942901. The cubic root of 20508707 is about 273.7239258472.

The spelling of 20508707 in words is "twenty million, five hundred eight thousand, seven hundred seven".