20798851 has 2 divisors, whose sum is σ = 20798852. Its totient is φ = 20798850.

The previous prime is 20798839. The next prime is 20798867. The reversal of 20798851 is 15889702.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20798851 is a prime.

It is not a weakly prime, because it can be changed into another prime (20798881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10399425 + 10399426.

It is an arithmetic number, because the mean of its divisors is an integer number (10399426).

Almost surely, 2^20798851 is an apocalyptic number.

20798851 is a deficient number, since it is larger than the sum of its proper divisors (1).

20798851 is an equidigital number, since it uses as much as digits as its factorization.

20798851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 20798851 is about 4560.5757311989. The cubic root of 20798851 is about 275.0087093660.

The spelling of 20798851 in words is "twenty million, seven hundred ninety-eight thousand, eight hundred fifty-one".