21205520

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{1993}}^1$

素因数の和:2032

約数の個数: 80

約数和(自身を含む): 59341440

約数和(自身を除く): 38135920

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 19, 20, 28, 35, 38, 40, 56, 70, 76, 80, 95, 112, 133, 140, 152, 190, 266, 280, 304, 380, 532, 560, 665, 760, 1064, 1330, 1520, 1993, 2128, 2660, 3986, 5320, 7972, 9965, 10640, 13951, 15944, 19930, 27902, 31888, 37867, 39860, 55804, 69755, 75734, 79720, 111608, 139510, 151468, 159440, 189335, 223216, 265069, 279020, 302936, 378670, 530138, 558040, 605872, 757340, 1060276, 1116080, 1325345, 1514680, 2120552, 2650690, 3029360, 4241104, 5301380, 10602760, 21205520]

約数ペア:

[(1, 21205520), (2, 10602760), (4, 5301380), (5, 4241104), (7, 3029360), (8, 2650690), (10, 2120552), (14, 1514680), (16, 1325345), (19, 1116080), (20, 1060276), (28, 757340), (35, 605872), (38, 558040), (40, 530138), (56, 378670), (70, 302936), (76, 279020), (80, 265069), (95, 223216), (112, 189335), (133, 159440), (140, 151468), (152, 139510), (190, 111608), (266, 79720), (280, 75734), (304, 69755), (380, 55804), (532, 39860), (560, 37867), (665, 31888), (760, 27902), (1064, 19930), (1330, 15944), (1520, 13951), (1993, 10640), (2128, 9965), (2660, 7972), (3986, 5320)]