640001280

素因数分解:

$2^8\times 3^1\times 5^1\times {\mathrm{166667}}^1$

素因数の和:166691

約数の個数: 72

約数和(自身を含む): 2044016352

約数和(自身を除く): 1404015072

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 48, 60, 64, 80, 96, 120, 128, 160, 192, 240, 256, 320, 384, 480, 640, 768, 960, 1280, 1920, 3840, 166667, 333334, 500001, 666668, 833335, 1000002, 1333336, 1666670, 2000004, 2500005, 2666672, 3333340, 4000008, 5000010, 5333344, 6666680, 8000016, 10000020, 10666688, 13333360, 16000032, 20000040, 21333376, 26666720, 32000064, 40000080, 42666752, 53333440, 64000128, 80000160, 106666880, 128000256, 160000320, 213333760, 320000640, 640001280]

約数ペア:

[(1, 640001280), (2, 320000640), (3, 213333760), (4, 160000320), (5, 128000256), (6, 106666880), (8, 80000160), (10, 64000128), (12, 53333440), (15, 42666752), (16, 40000080), (20, 32000064), (24, 26666720), (30, 21333376), (32, 20000040), (40, 16000032), (48, 13333360), (60, 10666688), (64, 10000020), (80, 8000016), (96, 6666680), (120, 5333344), (128, 5000010), (160, 4000008), (192, 3333340), (240, 2666672), (256, 2500005), (320, 2000004), (384, 1666670), (480, 1333336), (640, 1000002), (768, 833335), (960, 666668), (1280, 500001), (1920, 333334), (3840, 166667)]