20918730

素因数分解:

$2^1\times 3^1\times 5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{71}}^1$

素因数の和:172

約数の個数: 128

約数和(自身を含む): 61710336

約数和(自身を除く): 40791606

約数列:

[1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 23, 30, 35, 42, 46, 61, 69, 70, 71, 105, 115, 122, 138, 142, 161, 183, 210, 213, 230, 305, 322, 345, 355, 366, 426, 427, 483, 497, 610, 690, 710, 805, 854, 915, 966, 994, 1065, 1281, 1403, 1491, 1610, 1633, 1830, 2130, 2135, 2415, 2485, 2562, 2806, 2982, 3266, 4209, 4270, 4331, 4830, 4899, 4970, 6405, 7015, 7455, 8165, 8418, 8662, 9798, 9821, 11431, 12810, 12993, 14030, 14910, 16330, 19642, 21045, 21655, 22862, 24495, 25986, 29463, 30317, 34293, 42090, 43310, 48990, 49105, 57155, 58926, 60634, 64965, 68586, 90951, 98210, 99613, 114310, 129930, 147315, 151585, 171465, 181902, 199226, 294630, 298839, 303170, 342930, 454755, 498065, 597678, 697291, 909510, 996130, 1394582, 1494195, 2091873, 2988390, 3486455, 4183746, 6972910, 10459365, 20918730]

約数ペア:

[(1, 20918730), (2, 10459365), (3, 6972910), (5, 4183746), (6, 3486455), (7, 2988390), (10, 2091873), (14, 1494195), (15, 1394582), (21, 996130), (23, 909510), (30, 697291), (35, 597678), (42, 498065), (46, 454755), (61, 342930), (69, 303170), (70, 298839), (71, 294630), (105, 199226), (115, 181902), (122, 171465), (138, 151585), (142, 147315), (161, 129930), (183, 114310), (210, 99613), (213, 98210), (230, 90951), (305, 68586), (322, 64965), (345, 60634), (355, 58926), (366, 57155), (426, 49105), (427, 48990), (483, 43310), (497, 42090), (610, 34293), (690, 30317), (710, 29463), (805, 25986), (854, 24495), (915, 22862), (966, 21655), (994, 21045), (1065, 19642), (1281, 16330), (1403, 14910), (1491, 14030), (1610, 12993), (1633, 12810), (1830, 11431), (2130, 9821), (2135, 9798), (2415, 8662), (2485, 8418), (2562, 8165), (2806, 7455), (2982, 7015), (3266, 6405), (4209, 4970), (4270, 4899), (4331, 4830)]