20781540

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{83}}^1\times {\mathrm{107}}^1$

素因数の和:218

約数の個数: 144

約数和(自身を含む): 69346368

約数和(自身を除く): 48564828

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 13, 15, 18, 20, 26, 30, 36, 39, 45, 52, 60, 65, 78, 83, 90, 107, 117, 130, 156, 166, 180, 195, 214, 234, 249, 260, 321, 332, 390, 415, 428, 468, 498, 535, 585, 642, 747, 780, 830, 963, 996, 1070, 1079, 1170, 1245, 1284, 1391, 1494, 1605, 1660, 1926, 2140, 2158, 2340, 2490, 2782, 2988, 3210, 3237, 3735, 3852, 4173, 4316, 4815, 4980, 5395, 5564, 6420, 6474, 6955, 7470, 8346, 8881, 9630, 9711, 10790, 12519, 12948, 13910, 14940, 16185, 16692, 17762, 19260, 19422, 20865, 21580, 25038, 26643, 27820, 32370, 35524, 38844, 41730, 44405, 48555, 50076, 53286, 62595, 64740, 79929, 83460, 88810, 97110, 106572, 115453, 125190, 133215, 159858, 177620, 194220, 230906, 250380, 266430, 319716, 346359, 399645, 461812, 532860, 577265, 692718, 799290, 1039077, 1154530, 1385436, 1598580, 1731795, 2078154, 2309060, 3463590, 4156308, 5195385, 6927180, 10390770, 20781540]

約数ペア:

[(1, 20781540), (2, 10390770), (3, 6927180), (4, 5195385), (5, 4156308), (6, 3463590), (9, 2309060), (10, 2078154), (12, 1731795), (13, 1598580), (15, 1385436), (18, 1154530), (20, 1039077), (26, 799290), (30, 692718), (36, 577265), (39, 532860), (45, 461812), (52, 399645), (60, 346359), (65, 319716), (78, 266430), (83, 250380), (90, 230906), (107, 194220), (117, 177620), (130, 159858), (156, 133215), (166, 125190), (180, 115453), (195, 106572), (214, 97110), (234, 88810), (249, 83460), (260, 79929), (321, 64740), (332, 62595), (390, 53286), (415, 50076), (428, 48555), (468, 44405), (498, 41730), (535, 38844), (585, 35524), (642, 32370), (747, 27820), (780, 26643), (830, 25038), (963, 21580), (996, 20865), (1070, 19422), (1079, 19260), (1170, 17762), (1245, 16692), (1284, 16185), (1391, 14940), (1494, 13910), (1605, 12948), (1660, 12519), (1926, 10790), (2140, 9711), (2158, 9630), (2340, 8881), (2490, 8346), (2782, 7470), (2988, 6955), (3210, 6474), (3237, 6420), (3735, 5564), (3852, 5395), (4173, 4980), (4316, 4815)]