20315340 has 96 divisors (see below), whose sum is σ = 66951360. Its totient is φ = 5096448.

The previous prime is 20315303. The next prime is 20315359. The reversal of 20315340 is 4351302.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8074 + ... + 10286.

It is an arithmetic number, because the mean of its divisors is an integer number (697410).

Almost surely, 2^20315340 is an apocalyptic number.

20315340 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 20315340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33475680).

20315340 is an abundant number, since it is smaller than the sum of its proper divisors (46636020).

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

20315340 is a wasteful number, since it uses less digits than its factorization.

20315340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2248 (or 2240 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20315340 is about 4507.2541530293. The cubic root of 20315340 is about 272.8609362990.

Adding to 20315340 its reverse (4351302), we get a palindrome (24666642).

The spelling of 20315340 in words is "twenty million, three hundred fifteen thousand, three hundred forty".