638367440

素因数分解:

$2^4\times 5^1\times {\mathrm{61}}^1\times {\mathrm{257}}^1\times {\mathrm{509}}^1$

素因数の和:840

約数の個数: 80

約数和(自身を含む): 1517380560

約数和(自身を除く): 879013120

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 61, 80, 122, 244, 257, 305, 488, 509, 514, 610, 976, 1018, 1028, 1220, 1285, 2036, 2056, 2440, 2545, 2570, 4072, 4112, 4880, 5090, 5140, 8144, 10180, 10280, 15677, 20360, 20560, 31049, 31354, 40720, 62098, 62708, 78385, 124196, 125416, 130813, 155245, 156770, 248392, 250832, 261626, 310490, 313540, 496784, 523252, 620980, 627080, 654065, 1046504, 1241960, 1254160, 1308130, 2093008, 2483920, 2616260, 5232520, 7979593, 10465040, 15959186, 31918372, 39897965, 63836744, 79795930, 127673488, 159591860, 319183720, 638367440]

約数ペア:

[(1, 638367440), (2, 319183720), (4, 159591860), (5, 127673488), (8, 79795930), (10, 63836744), (16, 39897965), (20, 31918372), (40, 15959186), (61, 10465040), (80, 7979593), (122, 5232520), (244, 2616260), (257, 2483920), (305, 2093008), (488, 1308130), (509, 1254160), (514, 1241960), (610, 1046504), (976, 654065), (1018, 627080), (1028, 620980), (1220, 523252), (1285, 496784), (2036, 313540), (2056, 310490), (2440, 261626), (2545, 250832), (2570, 248392), (4072, 156770), (4112, 155245), (4880, 130813), (5090, 125416), (5140, 124196), (8144, 78385), (10180, 62708), (10280, 62098), (15677, 40720), (20360, 31354), (20560, 31049)]