21128535

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{389}}^1$

素因数の和:488

約数の個数: 48

約数和(自身を含む): 39424320

約数和(自身を除く): 18295785

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 71, 85, 153, 213, 255, 355, 389, 639, 765, 1065, 1167, 1207, 1945, 3195, 3501, 3621, 5835, 6035, 6613, 10863, 17505, 18105, 19839, 27619, 33065, 54315, 59517, 82857, 99195, 138095, 248571, 297585, 414285, 469523, 1242855, 1408569, 2347615, 4225707, 7042845, 21128535]

約数ペア:

[(1, 21128535), (3, 7042845), (5, 4225707), (9, 2347615), (15, 1408569), (17, 1242855), (45, 469523), (51, 414285), (71, 297585), (85, 248571), (153, 138095), (213, 99195), (255, 82857), (355, 59517), (389, 54315), (639, 33065), (765, 27619), (1065, 19839), (1167, 18105), (1207, 17505), (1945, 10863), (3195, 6613), (3501, 6035), (3621, 5835)]