20718960

素因数分解:

$2^4\times 3^1\times 5^1\times {\mathrm{131}}^1\times {\mathrm{659}}^1$

素因数の和:806

約数の個数: 80

約数和(自身を含む): 64817280

約数和(自身を除く): 44098320

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120, 131, 240, 262, 393, 524, 655, 659, 786, 1048, 1310, 1318, 1572, 1965, 1977, 2096, 2620, 2636, 3144, 3295, 3930, 3954, 5240, 5272, 6288, 6590, 7860, 7908, 9885, 10480, 10544, 13180, 15720, 15816, 19770, 26360, 31440, 31632, 39540, 52720, 79080, 86329, 158160, 172658, 258987, 345316, 431645, 517974, 690632, 863290, 1035948, 1294935, 1381264, 1726580, 2071896, 2589870, 3453160, 4143792, 5179740, 6906320, 10359480, 20718960]

約数ペア:

[(1, 20718960), (2, 10359480), (3, 6906320), (4, 5179740), (5, 4143792), (6, 3453160), (8, 2589870), (10, 2071896), (12, 1726580), (15, 1381264), (16, 1294935), (20, 1035948), (24, 863290), (30, 690632), (40, 517974), (48, 431645), (60, 345316), (80, 258987), (120, 172658), (131, 158160), (240, 86329), (262, 79080), (393, 52720), (524, 39540), (655, 31632), (659, 31440), (786, 26360), (1048, 19770), (1310, 15816), (1318, 15720), (1572, 13180), (1965, 10544), (1977, 10480), (2096, 9885), (2620, 7908), (2636, 7860), (3144, 6590), (3295, 6288), (3930, 5272), (3954, 5240)]