20091340 has 12 divisors (see below), whose sum is σ = 42191856. Its totient is φ = 8036528.

The previous prime is 20091311. The next prime is 20091347. The reversal of 20091340 is 4319002.

It is not an unprimeable number, because it can be changed into a prime (20091347) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 502264 + ... + 502303.

It is an arithmetic number, because the mean of its divisors is an integer number (3515988).

Almost surely, 2^20091340 is an apocalyptic number.

20091340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20091340 is an abundant number, since it is smaller than the sum of its proper divisors (22100516).

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

20091340 is a wasteful number, since it uses less digits than its factorization.

20091340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004576 (or 1004574 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 20091340 is about 4482.3364443112. The cubic root of 20091340 is about 271.8543590266.

The spelling of 20091340 in words is "twenty million, ninety-one thousand, three hundred forty".