21995920

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{499}}^1$

素因数の和:560

約数の個数: 80

約数和(自身を含む): 55800000

約数和(自身を除く): 33804080

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 29, 38, 40, 58, 76, 80, 95, 116, 145, 152, 190, 232, 290, 304, 380, 464, 499, 551, 580, 760, 998, 1102, 1160, 1520, 1996, 2204, 2320, 2495, 2755, 3992, 4408, 4990, 5510, 7984, 8816, 9481, 9980, 11020, 14471, 18962, 19960, 22040, 28942, 37924, 39920, 44080, 47405, 57884, 72355, 75848, 94810, 115768, 144710, 151696, 189620, 231536, 274949, 289420, 379240, 549898, 578840, 758480, 1099796, 1157680, 1374745, 2199592, 2749490, 4399184, 5498980, 10997960, 21995920]

約数ペア:

[(1, 21995920), (2, 10997960), (4, 5498980), (5, 4399184), (8, 2749490), (10, 2199592), (16, 1374745), (19, 1157680), (20, 1099796), (29, 758480), (38, 578840), (40, 549898), (58, 379240), (76, 289420), (80, 274949), (95, 231536), (116, 189620), (145, 151696), (152, 144710), (190, 115768), (232, 94810), (290, 75848), (304, 72355), (380, 57884), (464, 47405), (499, 44080), (551, 39920), (580, 37924), (760, 28942), (998, 22040), (1102, 19960), (1160, 18962), (1520, 14471), (1996, 11020), (2204, 9980), (2320, 9481), (2495, 8816), (2755, 7984), (3992, 5510), (4408, 4990)]