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20155001015 = 5172917214751
BaseRepresentation
bin10010110001010101…
…001110100010110111
31221000122012010200002
4102301111032202313
5312234140013030
613131543341515
71312313452622
oct226125164267
957018163602
1020155001015
118602a77636
123aa5a5189b
131b92837c06
14d92b12db9
157ce687245
hex4b154e8b7

20155001015 has 32 divisors (see below), whose sum is σ = 26512738560. Its totient is φ = 14640640000.

The previous prime is 20155001003. The next prime is 20155001047. The reversal of 20155001015 is 51010055102.

It is a happy number.

It is not a de Polignac number, because 20155001015 - 230 = 19081259191 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4239890 + ... + 4244640.

It is an arithmetic number, because the mean of its divisors is an integer number (828523080).

Almost surely, 220155001015 is an apocalyptic number.

20155001015 is a deficient number, since it is larger than the sum of its proper divisors (6357737545).

20155001015 is a wasteful number, since it uses less digits than its factorization.

20155001015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6523.

The product of its (nonzero) digits is 250, while the sum is 20.

Adding to 20155001015 its reverse (51010055102), we get a palindrome (71165056117).

The spelling of 20155001015 in words is "twenty billion, one hundred fifty-five million, one thousand, fifteen".

Divisors: 1 5 17 29 85 145 493 1721 2465 4751 8605 23755 29257 49909 80767 137779 146285 249545 403835 688895 848453 2342243 4242265 8176471 11711215 40882355 139000007 237117659 695000035 1185588295 4031000203 20155001015