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20420102243 = 281467155609
BaseRepresentation
bin10011000001001000…
…100000100001100011
31221201010000200012002
4103001020200201203
5313310021232433
613214133354215
71322013001532
oct230110404143
957633020162
1020420102243
118729685062
123b5a79896b
131c05737048
14dba000319
157e7aa09e8
hex4c1220863

20420102243 has 8 divisors (see below), whose sum is σ = 20536785360. Its totient is φ = 20303731840.

The previous prime is 20420102207. The next prime is 20420102251. The reversal of 20420102243 is 34220102402.

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 20420102243 - 26 = 20420102179 is a prime.

It is a super-2 number, since 2×204201022432 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20420102293) by changing a digit.

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, 53423 + ... + 209031.

It is an arithmetic number, because the mean of its divisors is an integer number (2567098170).

Almost surely, 220420102243 is an apocalyptic number.

20420102243 is a deficient number, since it is larger than the sum of its proper divisors (116683117).

20420102243 is a wasteful number, since it uses less digits than its factorization.

20420102243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156357.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20420102243 its reverse (34220102402), we get a palindrome (54640204645).

The spelling of 20420102243 in words is "twenty billion, four hundred twenty million, one hundred two thousand, two hundred forty-three".

Divisors: 1 281 467 131227 155609 43726129 72669403 20420102243