20519140 has 12 divisors (see below), whose sum is σ = 43090236. Its totient is φ = 8207648.

The previous prime is 20519129. The next prime is 20519159. The reversal of 20519140 is 4191502.

It can be written as a sum of positive squares in 2 ways, for example, as 10137856 + 10381284 = 3184^2 + 3222^2 .

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 3 ways as a sum of consecutive naturals, for example, 512959 + ... + 512998.

It is an arithmetic number, because the mean of its divisors is an integer number (3590853).

Almost surely, 2^20519140 is an apocalyptic number.

20519140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20519140 is an abundant number, since it is smaller than the sum of its proper divisors (22571096).

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

20519140 is a wasteful number, since it uses less digits than its factorization.

20519140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025966 (or 1025964 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 20519140 is about 4529.8057353489. The cubic root of 20519140 is about 273.7703334146.

The spelling of 20519140 in words is "twenty million, five hundred nineteen thousand, one hundred forty".