20113919 has 4 divisors (see below), whose sum is σ = 22987344. Its totient is φ = 17240496.

The previous prime is 20113883. The next prime is 20113927. The reversal of 20113919 is 91931102.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-20113919 is a prime.

It is a super-2 number, since 2×20113919² = 809139475077122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1436702 + ... + 1436715.

It is an arithmetic number, because the mean of its divisors is an integer number (5746836).

Almost surely, 2^20113919 is an apocalyptic number.

20113919 is a deficient number, since it is larger than the sum of its proper divisors (2873425).

20113919 is an equidigital number, since it uses as much as digits as its factorization.

20113919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2873424.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 20113919 is about 4484.8544012041. The cubic root of 20113919 is about 271.9561591322.

The spelling of 20113919 in words is "twenty million, one hundred thirteen thousand, nine hundred nineteen".