20908907 has 2 divisors, whose sum is σ = 20908908. Its totient is φ = 20908906.

The previous prime is 20908883. The next prime is 20908931. The reversal of 20908907 is 70980902.

It is a balanced prime because it is at equal distance from previous prime (20908883) and next prime (20908931).

It is a cyclic number.

It is not a de Polignac number, because 20908907 - 2⁸ = 20908651 is a prime.

It is not a weakly prime, because it can be changed into another prime (20908957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10454453 + 10454454.

It is an arithmetic number, because the mean of its divisors is an integer number (10454454).

Almost surely, 2^20908907 is an apocalyptic number.

20908907 is a deficient number, since it is larger than the sum of its proper divisors (1).

20908907 is an equidigital number, since it uses as much as digits as its factorization.

20908907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 20908907 is about 4572.6258320575. The cubic root of 20908907 is about 275.4929208998.

The spelling of 20908907 in words is "twenty million, nine hundred eight thousand, nine hundred seven".