20898023 has 4 divisors (see below), whose sum is σ = 20908368. Its totient is φ = 20887680.

The previous prime is 20897993. The next prime is 20898041. The reversal of 20898023 is 32089802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20898023 - 2¹² = 20893927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20898223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1043 + ... + 6548.

It is an arithmetic number, because the mean of its divisors is an integer number (5227092).

Almost surely, 2^20898023 is an apocalyptic number.

20898023 is a deficient number, since it is larger than the sum of its proper divisors (10345).

20898023 is an equidigital number, since it uses as much as digits as its factorization.

20898023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10344.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 20898023 is about 4571.4355513340. The cubic root of 20898023 is about 275.4451105675.

The spelling of 20898023 in words is "twenty million, eight hundred ninety-eight thousand, twenty-three".