20138019 has 8 divisors (see below), whose sum is σ = 29291712. Its totient is φ = 12204840.

The previous prime is 20137993. The next prime is 20138021. The reversal of 20138019 is 91083102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20138019 - 2¹⁵ = 20105251 is a prime.

It is a super-2 number, since 2×20138019² = 811079618488722, which contains 22 as substring.

It is a zygodrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 20138019.

It is not an unprimeable number, because it can be changed into a prime (20138089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305089 + ... + 305154.

It is an arithmetic number, because the mean of its divisors is an integer number (3661464).

Almost surely, 2^20138019 is an apocalyptic number.

20138019 is a deficient number, since it is larger than the sum of its proper divisors (9153693).

20138019 is a wasteful number, since it uses less digits than its factorization.

20138019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610257.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 20138019 is about 4487.5404176453. The cubic root of 20138019 is about 272.0647328270.

The spelling of 20138019 in words is "twenty million, one hundred thirty-eight thousand, nineteen".