20125819 has 6 divisors (see below), whose sum is σ = 23411724. Its totient is φ = 17250660.

The previous prime is 20125799. The next prime is 20125829. The reversal of 20125819 is 91852102.

It is not a de Polignac number, because 20125819 - 2⁹ = 20125307 is a prime.

It is a super-2 number, since 2×20125819² = 810097180841522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20125829) 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 5 ways as a sum of consecutive naturals, for example, 205317 + ... + 205414.

It is an arithmetic number, because the mean of its divisors is an integer number (3901954).

Almost surely, 2^20125819 is an apocalyptic number.

20125819 is a deficient number, since it is larger than the sum of its proper divisors (3285905).

20125819 is an equidigital number, since it uses as much as digits as its factorization.

20125819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410745 (or 410738 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 20125819 is about 4486.1808924741. The cubic root of 20125819 is about 272.0097810424.

The spelling of 20125819 in words is "twenty million, one hundred twenty-five thousand, eight hundred nineteen".