20436640

素因数分解:

$2^5\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{257}}^1$

素因数の和:350

約数の個数: 96

約数和(自身を含む): 56173824

約数和(自身を除く): 35737184

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 56, 70, 71, 80, 112, 140, 142, 160, 224, 257, 280, 284, 355, 497, 514, 560, 568, 710, 994, 1028, 1120, 1136, 1285, 1420, 1799, 1988, 2056, 2272, 2485, 2570, 2840, 3598, 3976, 4112, 4970, 5140, 5680, 7196, 7952, 8224, 8995, 9940, 10280, 11360, 14392, 15904, 17990, 18247, 19880, 20560, 28784, 35980, 36494, 39760, 41120, 57568, 71960, 72988, 79520, 91235, 127729, 143920, 145976, 182470, 255458, 287840, 291952, 364940, 510916, 583904, 638645, 729880, 1021832, 1277290, 1459760, 2043664, 2554580, 2919520, 4087328, 5109160, 10218320, 20436640]

約数ペア:

[(1, 20436640), (2, 10218320), (4, 5109160), (5, 4087328), (7, 2919520), (8, 2554580), (10, 2043664), (14, 1459760), (16, 1277290), (20, 1021832), (28, 729880), (32, 638645), (35, 583904), (40, 510916), (56, 364940), (70, 291952), (71, 287840), (80, 255458), (112, 182470), (140, 145976), (142, 143920), (160, 127729), (224, 91235), (257, 79520), (280, 72988), (284, 71960), (355, 57568), (497, 41120), (514, 39760), (560, 36494), (568, 35980), (710, 28784), (994, 20560), (1028, 19880), (1120, 18247), (1136, 17990), (1285, 15904), (1420, 14392), (1799, 11360), (1988, 10280), (2056, 9940), (2272, 8995), (2485, 8224), (2570, 7952), (2840, 7196), (3598, 5680), (3976, 5140), (4112, 4970)]