20906307 has 12 divisors (see below), whose sum is σ = 31172544. Its totient is φ = 13487760.

The previous prime is 20906297. The next prime is 20906317. The reversal of 20906307 is 70360902.

20906307 is a `hidden beast` number, since 20 + 9 + 0 + 630 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (20906297) and next prime (20906317).

It is not a de Polignac number, because 20906307 - 2⁸ = 20906051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20906317) 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 in 11 ways as a sum of consecutive naturals, for example, 37188 + ... + 37745.

It is an arithmetic number, because the mean of its divisors is an integer number (2597712).

Almost surely, 2^20906307 is an apocalyptic number.

20906307 is a deficient number, since it is larger than the sum of its proper divisors (10266237).

20906307 is a wasteful number, since it uses less digits than its factorization.

20906307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74970 (or 74967 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 20906307 is about 4572.3415226774. The cubic root of 20906307 is about 275.4815013441.

The spelling of 20906307 in words is "twenty million, nine hundred six thousand, three hundred seven".