20907863 has 2 divisors, whose sum is σ = 20907864. Its totient is φ = 20907862.

The previous prime is 20907839. The next prime is 20907877. The reversal of 20907863 is 36870902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20907863 - 2²⁴ = 4130647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20907823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10453931 + 10453932.

It is an arithmetic number, because the mean of its divisors is an integer number (10453932).

Almost surely, 2^20907863 is an apocalyptic number.

20907863 is a deficient number, since it is larger than the sum of its proper divisors (1).

20907863 is an equidigital number, since it uses as much as digits as its factorization.

20907863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20907863 is about 4572.5116730305. The cubic root of 20907863 is about 275.4883356227.

The spelling of 20907863 in words is "twenty million, nine hundred seven thousand, eight hundred sixty-three".