20898243 has 28 divisors (see below), whose sum is σ = 31740720. Its totient is φ = 13751856.

The previous prime is 20898223. The next prime is 20898257. The reversal of 20898243 is 34289802.

It is not a de Polignac number, because 20898243 - 2¹⁴ = 20881859 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20898198 and 20898207.

It is not an unprimeable number, because it can be changed into a prime (20898203) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 79330 + ... + 79592.

Almost surely, 2^20898243 is an apocalyptic number.

20898243 is a deficient number, since it is larger than the sum of its proper divisors (10842477).

20898243 is an equidigital number, since it uses as much as digits as its factorization.

20898243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 20898243 is about 4571.4596137339. The cubic root of 20898243 is about 275.4460771296.

The spelling of 20898243 in words is "twenty million, eight hundred ninety-eight thousand, two hundred forty-three".