20475907 has 2 divisors, whose sum is σ = 20475908. Its totient is φ = 20475906.

The previous prime is 20475893. The next prime is 20475913. The reversal of 20475907 is 70957402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20475907 is a prime.

It is not a weakly prime, because it can be changed into another prime (20475107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10237953 + 10237954.

It is an arithmetic number, because the mean of its divisors is an integer number (10237954).

Almost surely, 2^20475907 is an apocalyptic number.

20475907 is a deficient number, since it is larger than the sum of its proper divisors (1).

20475907 is an equidigital number, since it uses as much as digits as its factorization.

20475907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 20475907 is about 4525.0311601137. The cubic root of 20475907 is about 273.5779238697.

The spelling of 20475907 in words is "twenty million, four hundred seventy-five thousand, nine hundred seven".