20313288 has 64 divisors (see below), whose sum is σ = 56880000. Its totient is φ = 6716736.

The previous prime is 20313281. The next prime is 20313343. The reversal of 20313288 is 88231302.

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 (20313281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33613 + ... + 34211.

It is an arithmetic number, because the mean of its divisors is an integer number (888750).

Almost surely, 2^20313288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20313288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28440000).

20313288 is an abundant number, since it is smaller than the sum of its proper divisors (36566712).

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

20313288 is a wasteful number, since it uses less digits than its factorization.

20313288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771 (or 761 counting only the distinct ones).

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

The square root of 20313288 is about 4507.0265142331. The cubic root of 20313288 is about 272.8517489970.

The spelling of 20313288 in words is "twenty million, three hundred thirteen thousand, two hundred eighty-eight".