20280520

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{907}}^1$

素因数の和:974

約数の個数: 64

約数和(自身を含む): 50339520

約数和(自身を除く): 30059000

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 43, 52, 65, 86, 104, 130, 172, 215, 260, 344, 430, 520, 559, 860, 907, 1118, 1720, 1814, 2236, 2795, 3628, 4472, 4535, 5590, 7256, 9070, 11180, 11791, 18140, 22360, 23582, 36280, 39001, 47164, 58955, 78002, 94328, 117910, 156004, 195005, 235820, 312008, 390010, 471640, 507013, 780020, 1014026, 1560040, 2028052, 2535065, 4056104, 5070130, 10140260, 20280520]

約数ペア:

[(1, 20280520), (2, 10140260), (4, 5070130), (5, 4056104), (8, 2535065), (10, 2028052), (13, 1560040), (20, 1014026), (26, 780020), (40, 507013), (43, 471640), (52, 390010), (65, 312008), (86, 235820), (104, 195005), (130, 156004), (172, 117910), (215, 94328), (260, 78002), (344, 58955), (430, 47164), (520, 39001), (559, 36280), (860, 23582), (907, 22360), (1118, 18140), (1720, 11791), (1814, 11180), (2236, 9070), (2795, 7256), (3628, 5590), (4472, 4535)]