20313280 has 112 divisors (see below), whose sum is σ = 55046880. Its totient is φ = 7077888.

The previous prime is 20313247. The next prime is 20313281. The reversal of 20313280 is 8231302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20313281) 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, 78912 + ... + 79168.

It is an arithmetic number, because the mean of its divisors is an integer number (491490).

Almost surely, 2^20313280 is an apocalyptic number.

20313280 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 20313280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27523440).

20313280 is an abundant number, since it is smaller than the sum of its proper divisors (34733600).

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

20313280 is a wasteful number, since it uses less digits than its factorization.

20313280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20313280 is about 4507.0256267299. The cubic root of 20313280 is about 272.8517131778.

Adding to 20313280 its reverse (8231302), we get a palindrome (28544582).

The spelling of 20313280 in words is "twenty million, three hundred thirteen thousand, two hundred eighty".