20371340 has 96 divisors (see below), whose sum is σ = 50319360. Its totient is φ = 6854400.

The previous prime is 20371339. The next prime is 20371357. The reversal of 20371340 is 4317302.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 197729 + ... + 197831.

It is an arithmetic number, because the mean of its divisors is an integer number (524160).

Almost surely, 2^20371340 is an apocalyptic number.

20371340 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 20371340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25159680).

20371340 is an abundant number, since it is smaller than the sum of its proper divisors (29948020).

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

20371340 is a wasteful number, since it uses less digits than its factorization.

20371340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 20371340 is about 4513.4620858051. The cubic root of 20371340 is about 273.1114234306. Note that the first 3 decimals are identical.

Adding to 20371340 its reverse (4317302), we get a palindrome (24688642).

The spelling of 20371340 in words is "twenty million, three hundred seventy-one thousand, three hundred forty".