20463280 has 40 divisors (see below), whose sum is σ = 47876400. Its totient is φ = 8133888.

The previous prime is 20463271. The next prime is 20463293. The reversal of 20463280 is 8236402.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13606 + ... + 15034.

It is an arithmetic number, because the mean of its divisors is an integer number (1196910).

Almost surely, 2^20463280 is an apocalyptic number.

20463280 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 20463280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23938200).

20463280 is an abundant number, since it is smaller than the sum of its proper divisors (27413120).

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

20463280 is a wasteful number, since it uses less digits than its factorization.

20463280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621 (or 1615 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20463280 is about 4523.6357059339. The cubic root of 20463280 is about 273.5216759945.

Adding to 20463280 its reverse (8236402), we get a palindrome (28699682).

The spelling of 20463280 in words is "twenty million, four hundred sixty-three thousand, two hundred eighty".