18451480

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{73}}^1\times {\mathrm{89}}^1$

素因数の和:244

約数の個数: 64

約数和(自身を含む): 43156800

約数和(自身を除く): 24705320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 73, 89, 142, 146, 178, 284, 292, 355, 356, 365, 445, 568, 584, 710, 712, 730, 890, 1420, 1460, 1780, 2840, 2920, 3560, 5183, 6319, 6497, 10366, 12638, 12994, 20732, 25276, 25915, 25988, 31595, 32485, 41464, 50552, 51830, 51976, 63190, 64970, 103660, 126380, 129940, 207320, 252760, 259880, 461287, 922574, 1845148, 2306435, 3690296, 4612870, 9225740, 18451480]

約数ペア:

[(1, 18451480), (2, 9225740), (4, 4612870), (5, 3690296), (8, 2306435), (10, 1845148), (20, 922574), (40, 461287), (71, 259880), (73, 252760), (89, 207320), (142, 129940), (146, 126380), (178, 103660), (284, 64970), (292, 63190), (355, 51976), (356, 51830), (365, 50552), (445, 41464), (568, 32485), (584, 31595), (710, 25988), (712, 25915), (730, 25276), (890, 20732), (1420, 12994), (1460, 12638), (1780, 10366), (2840, 6497), (2920, 6319), (3560, 5183)]