20898220 has 48 divisors (see below), whose sum is σ = 50637888. Its totient is φ = 7096320.

The previous prime is 20898217. The next prime is 20898223. The reversal of 20898220 is 2289802.

It is an interprime number because it is at equal distance from previous prime (20898217) and next prime (20898223).

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 15 ways as a sum of consecutive naturals, for example, 15160 + ... + 16480.

It is an arithmetic number, because the mean of its divisors is an integer number (1054956).

Almost surely, 2^20898220 is an apocalyptic number.

20898220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20898220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25318944).

20898220 is an abundant number, since it is smaller than the sum of its proper divisors (29739668).

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

20898220 is a wasteful number, since it uses less digits than its factorization.

20898220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450 (or 1448 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 20898220 is about 4571.4570981253. The cubic root of 20898220 is about 275.4459760802.

The spelling of 20898220 in words is "twenty million, eight hundred ninety-eight thousand, two hundred twenty".