20631907 has 2 divisors, whose sum is σ = 20631908. Its totient is φ = 20631906.

The previous prime is 20631899. The next prime is 20631911. The reversal of 20631907 is 70913602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20631907 - 2³ = 20631899 is a prime.

It is not a weakly prime, because it can be changed into another prime (20631937) 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, 10315953 + 10315954.

It is an arithmetic number, because the mean of its divisors is an integer number (10315954).

Almost surely, 2^20631907 is an apocalyptic number.

20631907 is a deficient number, since it is larger than the sum of its proper divisors (1).

20631907 is an equidigital number, since it uses as much as digits as its factorization.

20631907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 20631907 is about 4542.2359031649. The cubic root of 20631907 is about 274.2709371818.

The spelling of 20631907 in words is "twenty million, six hundred thirty-one thousand, nine hundred seven".