20519090 has 16 divisors (see below), whose sum is σ = 37933272. Its totient is φ = 7985664.

The previous prime is 20519077. The next prime is 20519099. The reversal of 20519090 is 9091502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13712209 + 6806881 = 3703^2 + 2609^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20519099) 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, 27359 + ... + 28098.

Almost surely, 2^20519090 is an apocalyptic number.

20519090 is a deficient number, since it is larger than the sum of its proper divisors (17414182).

20519090 is a wasteful number, since it uses less digits than its factorization.

20519090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55501.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 20519090 is about 4529.8002163451. The cubic root of 20519090 is about 273.7701110445.

The spelling of 20519090 in words is "twenty million, five hundred nineteen thousand, ninety".