20113145 has 8 divisors (see below), whose sum is σ = 25992456. Its totient is φ = 14852736.

The previous prime is 20113139. The next prime is 20113169. The reversal of 20113145 is 54131102.

20113145 = T₄₉₀ + T₄₉₁ + ... + T₆₁₉.

It can be written as a sum of positive squares in 4 ways, for example, as 6889 + 20106256 = 83^2 + 4484^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20113145 - 2⁶ = 20113081 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154652 + ... + 154781.

It is an arithmetic number, because the mean of its divisors is an integer number (3249057).

Almost surely, 2^20113145 is an apocalyptic number.

It is an amenable number.

20113145 is a deficient number, since it is larger than the sum of its proper divisors (5879311).

20113145 is a wasteful number, since it uses less digits than its factorization.

20113145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309451.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 20113145 is about 4484.7681099473. The cubic root of 20113145 is about 271.9526707226.

Adding to 20113145 its reverse (54131102), we get a palindrome (74244247).

The spelling of 20113145 in words is "twenty million, one hundred thirteen thousand, one hundred forty-five".