20354340 has 24 divisors (see below), whose sum is σ = 56992320. Its totient is φ = 5427808.

The previous prime is 20354311. The next prime is 20354357. The reversal of 20354340 is 4345302.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169560 + ... + 169679.

It is an arithmetic number, because the mean of its divisors is an integer number (2374680).

Almost surely, 2^20354340 is an apocalyptic number.

20354340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20354340 is an abundant number, since it is smaller than the sum of its proper divisors (36637980).

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

20354340 is a wasteful number, since it uses less digits than its factorization.

20354340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339251 (or 339249 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 20354340 is about 4511.5784377532. The cubic root of 20354340 is about 273.0354312720.

Adding to 20354340 its reverse (4345302), we get a palindrome (24699642).

The spelling of 20354340 in words is "twenty million, three hundred fifty-four thousand, three hundred forty".