20898338257 has 16 divisors (see below), whose sum is σ = 21671012160. Its totient is φ = 20140244800.

The previous prime is 20898338213. The next prime is 20898338273. The reversal of 20898338257 is 75283389802.

It is a cyclic number.

It is not a de Polignac number, because 20898338257 - 2⁷ = 20898338129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20898338198 and 20898338207.

It is not an unprimeable number, because it can be changed into a prime (20898338207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6036507 + ... + 6039967.

It is an arithmetic number, because the mean of its divisors is an integer number (1354438260).

Almost surely, 2^20898338257 is an apocalyptic number.

It is an amenable number.

20898338257 is a deficient number, since it is larger than the sum of its proper divisors (772673903).

20898338257 is a wasteful number, since it uses less digits than its factorization.

20898338257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5504.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 20898338257 in words is "twenty billion, eight hundred ninety-eight million, three hundred thirty-eight thousand, two hundred fifty-seven".