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19171206980 = 2258914877243
BaseRepresentation
bin10001110110101100…
…010110011101000100
31211111002000012221222
4101312230112131010
5303230312110410
612450201255512
71246036366502
oct216654263504
954432005858
1019171206980
118148712612
123870494598
131a66a83273
14cdc1c3672
15773107955
hex476b16744

19171206980 has 48 divisors (see below), whose sum is σ = 40744892160. Its totient is φ = 7576174848.

The previous prime is 19171206937. The next prime is 19171207001. The reversal of 19171206980 is 8960217191.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2643239 + ... + 2650481.

It is an arithmetic number, because the mean of its divisors is an integer number (848851920).

Almost surely, 219171206980 is an apocalyptic number.

19171206980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19171206980 is an abundant number, since it is smaller than the sum of its proper divisors (21573685180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19171206980 is a wasteful number, since it uses less digits than its factorization.

19171206980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8828 (or 8826 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 44.

The spelling of 19171206980 in words is "nineteen billion, one hundred seventy-one million, two hundred six thousand, nine hundred eighty".

Divisors: 1 2 4 5 10 20 89 178 356 445 890 1487 1780 2974 5948 7243 7435 14486 14870 28972 29740 36215 72430 132343 144860 264686 529372 644627 661715 1289254 1323430 2578508 2646860 3223135 6446270 10770341 12892540 21540682 43081364 53851705 107703410 215406820 958560349 1917120698 3834241396 4792801745 9585603490 19171206980