20013745 has 8 divisors (see below), whose sum is σ = 25280640. Its totient is φ = 15168240.

The previous prime is 20013739. The next prime is 20013751. The reversal of 20013745 is 54731002.

It is an interprime number because it is at equal distance from previous prime (20013739) and next prime (20013751).

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

It is not a de Polignac number, because 20013745 - 2³ = 20013737 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105241 + ... + 105430.

It is an arithmetic number, because the mean of its divisors is an integer number (3160080).

Almost surely, 2^20013745 is an apocalyptic number.

It is an amenable number.

20013745 is a deficient number, since it is larger than the sum of its proper divisors (5266895).

20013745 is a wasteful number, since it uses less digits than its factorization.

20013745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210695.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20013745 is about 4473.6724287771. The cubic root of 20013745 is about 271.5039302035.

Adding to 20013745 its reverse (54731002), we get a palindrome (74744747).

The spelling of 20013745 in words is "twenty million, thirteen thousand, seven hundred forty-five".