20104340 has 12 divisors (see below), whose sum is σ = 42219156. Its totient is φ = 8041728.

The previous prime is 20104333. The next prime is 20104351. The reversal of 20104340 is 4340102.

It can be written as a sum of positive squares in 2 ways, for example, as 4072324 + 16032016 = 2018^2 + 4004^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502589 + ... + 502628.

It is an arithmetic number, because the mean of its divisors is an integer number (3518263).

Almost surely, 2^20104340 is an apocalyptic number.

20104340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20104340 is an abundant number, since it is smaller than the sum of its proper divisors (22114816).

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

20104340 is a wasteful number, since it uses less digits than its factorization.

20104340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005226 (or 1005224 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20104340 is about 4483.7863463818. The cubic root of 20104340 is about 271.9129803812.

Adding to 20104340 its reverse (4340102), we get a palindrome (24444442).

The spelling of 20104340 in words is "twenty million, one hundred four thousand, three hundred forty".