20898863 has 2 divisors, whose sum is σ = 20898864. Its totient is φ = 20898862.

The previous prime is 20898851. The next prime is 20898869. The reversal of 20898863 is 36889802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20898863 - 2⁴ = 20898847 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20898869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10449431 + 10449432.

It is an arithmetic number, because the mean of its divisors is an integer number (10449432).

Almost surely, 2^20898863 is an apocalyptic number.

20898863 is a deficient number, since it is larger than the sum of its proper divisors (1).

20898863 is an equidigital number, since it uses as much as digits as its factorization.

20898863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 20898863 is about 4571.5274252705. The cubic root of 20898863 is about 275.4488010408.

The spelling of 20898863 in words is "twenty million, eight hundred ninety-eight thousand, eight hundred sixty-three".