20001978

素因数分解:

$2^1\times 3^4\times {\mathrm{37}}^1\times {\mathrm{47}}^1\times {\mathrm{71}}^1$

素因数の和:169

約数の個数: 80

約数和(自身を含む): 47672064

約数和(自身を除く): 27670086

約数列:

[1, 2, 3, 6, 9, 18, 27, 37, 47, 54, 71, 74, 81, 94, 111, 141, 142, 162, 213, 222, 282, 333, 423, 426, 639, 666, 846, 999, 1269, 1278, 1739, 1917, 1998, 2538, 2627, 2997, 3337, 3478, 3807, 3834, 5217, 5254, 5751, 5994, 6674, 7614, 7881, 10011, 10434, 11502, 15651, 15762, 20022, 23643, 30033, 31302, 46953, 47286, 60066, 70929, 90099, 93906, 123469, 140859, 141858, 180198, 212787, 246938, 270297, 281718, 370407, 425574, 540594, 740814, 1111221, 2222442, 3333663, 6667326, 10000989, 20001978]

約数ペア:

[(1, 20001978), (2, 10000989), (3, 6667326), (6, 3333663), (9, 2222442), (18, 1111221), (27, 740814), (37, 540594), (47, 425574), (54, 370407), (71, 281718), (74, 270297), (81, 246938), (94, 212787), (111, 180198), (141, 141858), (142, 140859), (162, 123469), (213, 93906), (222, 90099), (282, 70929), (333, 60066), (423, 47286), (426, 46953), (639, 31302), (666, 30033), (846, 23643), (999, 20022), (1269, 15762), (1278, 15651), (1739, 11502), (1917, 10434), (1998, 10011), (2538, 7881), (2627, 7614), (2997, 6674), (3337, 5994), (3478, 5751), (3807, 5254), (3834, 5217)]