20283280 has 40 divisors (see below), whose sum is σ = 47836224. Its totient is φ = 7996800.

The previous prime is 20283257. The next prime is 20283287. The reversal of 20283280 is 8238202.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×20283280² = 822822895116800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20283287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3895 + ... + 7465.

Almost surely, 2^20283280 is an apocalyptic number.

20283280 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 20283280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23918112).

20283280 is an abundant number, since it is smaller than the sum of its proper divisors (27552944).

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

20283280 is a wasteful number, since it uses less digits than its factorization.

20283280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3655 (or 3649 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 20283280 is about 4503.6962597404. The cubic root of 20283280 is about 272.7173251591.

The spelling of 20283280 in words is "twenty million, two hundred eighty-three thousand, two hundred eighty".