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20717141813 = 43947191667
BaseRepresentation
bin10011010010110101…
…100111111100110101
31222110210221211212122
4103102311213330311
5314412042014223
613303424125325
71332250541234
oct232265477465
958423854778
1020717141813
118871317305
124022166845
131c521394c4
141007642b1b
15813bc75c8
hex4d2d67f35

20717141813 has 4 divisors (see below), whose sum is σ = 20764333920. Its totient is φ = 20669949708.

The previous prime is 20717141761. The next prime is 20717141821. The reversal of 20717141813 is 31814171702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31814171702 = 215907085851.

It is a cyclic number.

It is not a de Polignac number, because 20717141813 - 216 = 20717076277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20717141833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23595395 + ... + 23596272.

It is an arithmetic number, because the mean of its divisors is an integer number (5191083480).

Almost surely, 220717141813 is an apocalyptic number.

It is an amenable number.

20717141813 is a deficient number, since it is larger than the sum of its proper divisors (47192107).

20717141813 is an equidigital number, since it uses as much as digits as its factorization.

20717141813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47192106.

The product of its (nonzero) digits is 9408, while the sum is 35.

The spelling of 20717141813 in words is "twenty billion, seven hundred seventeen million, one hundred forty-one thousand, eight hundred thirteen".

Divisors: 1 439 47191667 20717141813