20898847 has 2 divisors, whose sum is σ = 20898848. Its totient is φ = 20898846.

The previous prime is 20898827. The next prime is 20898851. The reversal of 20898847 is 74889802.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20898847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20898797 and 20898806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20898827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10449423 + 10449424.

It is an arithmetic number, because the mean of its divisors is an integer number (10449424).

Almost surely, 2^20898847 is an apocalyptic number.

20898847 is a deficient number, since it is larger than the sum of its proper divisors (1).

20898847 is an equidigital number, since it uses as much as digits as its factorization.

20898847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 20898847 is about 4571.5256753080. The cubic root of 20898847 is about 275.4487307470.

The spelling of 20898847 in words is "twenty million, eight hundred ninety-eight thousand, eight hundred forty-seven".