20898 has 24 divisors (see below), whose sum is σ = 48048. Its totient is φ = 6804.

The previous prime is 20897. The next prime is 20899. The reversal of 20898 is 89802.

It is an interprime number because it is at equal distance from previous prime (20897) and next prime (20899).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 11 and base 14.

It is not an unprimeable number, because it can be changed into a prime (20897) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 465 + ... + 507.

It is an arithmetic number, because the mean of its divisors is an integer number (2002).

2²⁰⁸⁹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24024).

20898 is an abundant number, since it is smaller than the sum of its proper divisors (27150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20898 is an equidigital number, since it uses as much as digits as its factorization.

20898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 20898 is about 144.5614056379. The cubic root of 20898 is about 27.5445009517.

The spelling of 20898 in words is "twenty thousand, eight hundred ninety-eight".