20019340 has 24 divisors (see below), whose sum is σ = 45862992. Its totient is φ = 7279680.

The previous prime is 20019313. The next prime is 20019341. The reversal of 20019340 is 4391002.

It is not an unprimeable number, because it can be changed into a prime (20019341) 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 7 ways as a sum of consecutive naturals, for example, 45279 + ... + 45718.

It is an arithmetic number, because the mean of its divisors is an integer number (1910958).

Almost surely, 2^20019340 is an apocalyptic number.

20019340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20019340 is an abundant number, since it is smaller than the sum of its proper divisors (25843652).

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

20019340 is a wasteful number, since it uses less digits than its factorization.

20019340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91017 (or 91015 counting only the distinct ones).

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

The square root of 20019340 is about 4474.2977102558. The cubic root of 20019340 is about 271.5292282000.

The spelling of 20019340 in words is "twenty million, nineteen thousand, three hundred forty".