20519849 has 16 divisors (see below), whose sum is σ = 24414720. Its totient is φ = 16873920.

The previous prime is 20519839. The next prime is 20519857. The reversal of 20519849 is 94891502.

It is not a de Polignac number, because 20519849 - 2²⁴ = 3742633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20519839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54827 + ... + 55199.

It is an arithmetic number, because the mean of its divisors is an integer number (1525920).

Almost surely, 2^20519849 is an apocalyptic number.

20519849 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20519849 is a deficient number, since it is larger than the sum of its proper divisors (3894871).

20519849 is a wasteful number, since it uses less digits than its factorization.

20519849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 20519849 is about 4529.8839940996. The cubic root of 20519849 is about 273.7734865833.

The spelling of 20519849 in words is "twenty million, five hundred nineteen thousand, eight hundred forty-nine".