21266320

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{823}}^1$

素因数の和:872

約数の個数: 80

約数和(自身を含む): 55175040

約数和(自身を除く): 33908720

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 19, 20, 34, 38, 40, 68, 76, 80, 85, 95, 136, 152, 170, 190, 272, 304, 323, 340, 380, 646, 680, 760, 823, 1292, 1360, 1520, 1615, 1646, 2584, 3230, 3292, 4115, 5168, 6460, 6584, 8230, 12920, 13168, 13991, 15637, 16460, 25840, 27982, 31274, 32920, 55964, 62548, 65840, 69955, 78185, 111928, 125096, 139910, 156370, 223856, 250192, 265829, 279820, 312740, 531658, 559640, 625480, 1063316, 1119280, 1250960, 1329145, 2126632, 2658290, 4253264, 5316580, 10633160, 21266320]

約数ペア:

[(1, 21266320), (2, 10633160), (4, 5316580), (5, 4253264), (8, 2658290), (10, 2126632), (16, 1329145), (17, 1250960), (19, 1119280), (20, 1063316), (34, 625480), (38, 559640), (40, 531658), (68, 312740), (76, 279820), (80, 265829), (85, 250192), (95, 223856), (136, 156370), (152, 139910), (170, 125096), (190, 111928), (272, 78185), (304, 69955), (323, 65840), (340, 62548), (380, 55964), (646, 32920), (680, 31274), (760, 27982), (823, 25840), (1292, 16460), (1360, 15637), (1520, 13991), (1615, 13168), (1646, 12920), (2584, 8230), (3230, 6584), (3292, 6460), (4115, 5168)]