20898245 has 4 divisors (see below), whose sum is σ = 25077900. Its totient is φ = 16718592.

The previous prime is 20898223. The next prime is 20898257. The reversal of 20898245 is 54289802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14737921 + 6160324 = 3839^2 + 2482^2 .

It is a cyclic number.

It is not a de Polignac number, because 20898245 - 2¹⁰ = 20897221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20898199 and 20898208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2089820 + ... + 2089829.

It is an arithmetic number, because the mean of its divisors is an integer number (6269475).

Almost surely, 2^20898245 is an apocalyptic number.

It is an amenable number.

20898245 is a deficient number, since it is larger than the sum of its proper divisors (4179655).

20898245 is an equidigital number, since it uses as much as digits as its factorization.

20898245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4179654.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 20898245 is about 4571.4598324824. The cubic root of 20898245 is about 275.4460859165.

The spelling of 20898245 in words is "twenty million, eight hundred ninety-eight thousand, two hundred forty-five".