81217720

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{49523}}^1$

素因数の和:49575

約数の個数: 32

約数和(自身を含む): 187200720

約数和(自身を除く): 105983000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 49523, 99046, 198092, 247615, 396184, 495230, 990460, 1980920, 2030443, 4060886, 8121772, 10152215, 16243544, 20304430, 40608860, 81217720]

約数ペア:

[(1, 81217720), (2, 40608860), (4, 20304430), (5, 16243544), (8, 10152215), (10, 8121772), (20, 4060886), (40, 2030443), (41, 1980920), (82, 990460), (164, 495230), (205, 396184), (328, 247615), (410, 198092), (820, 99046), (1640, 49523)]