20535019 has 4 divisors (see below), whose sum is σ = 20601360. Its totient is φ = 20468680.

The previous prime is 20535013. The next prime is 20535043. The reversal of 20535019 is 91053502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91053502 = 2 ⋅45526751.

It is a cyclic number.

It is not a de Polignac number, because 20535019 - 2¹¹ = 20532971 is a prime.

It is a super-2 number, since 2×20535019² = 843374010660722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20534984 and 20535002.

It is not an unprimeable number, because it can be changed into a prime (20535013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32704 + ... + 33325.

It is an arithmetic number, because the mean of its divisors is an integer number (5150340).

Almost surely, 2^20535019 is an apocalyptic number.

20535019 is a deficient number, since it is larger than the sum of its proper divisors (66341).

20535019 is an equidigital number, since it uses as much as digits as its factorization.

20535019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66340.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 20535019 is about 4531.5581205585. The cubic root of 20535019 is about 273.8409354350.

The spelling of 20535019 in words is "twenty million, five hundred thirty-five thousand, nineteen".