21503720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{61}}^1\times {\mathrm{1259}}^1$

素因数の和:1338

約数の個数: 64

約数和(自身を含む): 56246400

約数和(自身を除く): 34742680

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 61, 70, 122, 140, 244, 280, 305, 427, 488, 610, 854, 1220, 1259, 1708, 2135, 2440, 2518, 3416, 4270, 5036, 6295, 8540, 8813, 10072, 12590, 17080, 17626, 25180, 35252, 44065, 50360, 70504, 76799, 88130, 153598, 176260, 307196, 352520, 383995, 537593, 614392, 767990, 1075186, 1535980, 2150372, 2687965, 3071960, 4300744, 5375930, 10751860, 21503720]

約数ペア:

[(1, 21503720), (2, 10751860), (4, 5375930), (5, 4300744), (7, 3071960), (8, 2687965), (10, 2150372), (14, 1535980), (20, 1075186), (28, 767990), (35, 614392), (40, 537593), (56, 383995), (61, 352520), (70, 307196), (122, 176260), (140, 153598), (244, 88130), (280, 76799), (305, 70504), (427, 50360), (488, 44065), (610, 35252), (854, 25180), (1220, 17626), (1259, 17080), (1708, 12590), (2135, 10072), (2440, 8813), (2518, 8540), (3416, 6295), (4270, 5036)]