20500340 has 48 divisors (see below), whose sum is σ = 49631232. Its totient is φ = 6967296.

The previous prime is 20500339. The next prime is 20500343. The reversal of 20500340 is 4300502.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500343) 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, 17204 + ... + 18356.

It is an arithmetic number, because the mean of its divisors is an integer number (1033984).

Almost surely, 2^20500340 is an apocalyptic number.

20500340 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 20500340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24815616).

20500340 is an abundant number, since it is smaller than the sum of its proper divisors (29130892).

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

20500340 is a wasteful number, since it uses less digits than its factorization.

20500340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296 (or 1294 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 14.

The square root of 20500340 is about 4527.7301156319. The cubic root of 20500340 is about 273.6866967879.

Adding to 20500340 its reverse (4300502), we get a palindrome (24800842).

The spelling of 20500340 in words is "twenty million, five hundred thousand, three hundred forty".