20918340

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{251}}^1\times {\mathrm{463}}^1$

素因数の和:729

約数の個数: 72

約数和(自身を含む): 63842688

約数和(自身を除く): 42924348

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180, 251, 463, 502, 753, 926, 1004, 1255, 1389, 1506, 1852, 2259, 2315, 2510, 2778, 3012, 3765, 4167, 4518, 4630, 5020, 5556, 6945, 7530, 8334, 9036, 9260, 11295, 13890, 15060, 16668, 20835, 22590, 27780, 41670, 45180, 83340, 116213, 232426, 348639, 464852, 581065, 697278, 1045917, 1162130, 1394556, 1743195, 2091834, 2324260, 3486390, 4183668, 5229585, 6972780, 10459170, 20918340]

約数ペア:

[(1, 20918340), (2, 10459170), (3, 6972780), (4, 5229585), (5, 4183668), (6, 3486390), (9, 2324260), (10, 2091834), (12, 1743195), (15, 1394556), (18, 1162130), (20, 1045917), (30, 697278), (36, 581065), (45, 464852), (60, 348639), (90, 232426), (180, 116213), (251, 83340), (463, 45180), (502, 41670), (753, 27780), (926, 22590), (1004, 20835), (1255, 16668), (1389, 15060), (1506, 13890), (1852, 11295), (2259, 9260), (2315, 9036), (2510, 8334), (2778, 7530), (3012, 6945), (3765, 5556), (4167, 5020), (4518, 4630)]