20489220 has 96 divisors (see below), whose sum is σ = 67132800. Its totient is φ = 5173632.

The previous prime is 20489191. The next prime is 20489221. The reversal of 20489220 is 2298402.

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

It is not an unprimeable number, because it can be changed into a prime (20489221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9262 + ... + 11258.

It is an arithmetic number, because the mean of its divisors is an integer number (699300).

Almost surely, 2^20489220 is an apocalyptic number.

20489220 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 20489220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33566400).

20489220 is an abundant number, since it is smaller than the sum of its proper divisors (46643580).

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

20489220 is a wasteful number, since it uses less digits than its factorization.

20489220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2034 (or 2026 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20489220 is about 4526.5019606756. The cubic root of 20489220 is about 273.6372025435.

The spelling of 20489220 in words is "twenty million, four hundred eighty-nine thousand, two hundred twenty".