21005710

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{239}}^1$

素因数の和:321

約数の個数: 64

約数和(自身を含む): 44789760

約数和(自身を除く): 23784050

約数列:

[1, 2, 5, 10, 11, 17, 22, 34, 47, 55, 85, 94, 110, 170, 187, 235, 239, 374, 470, 478, 517, 799, 935, 1034, 1195, 1598, 1870, 2390, 2585, 2629, 3995, 4063, 5170, 5258, 7990, 8126, 8789, 11233, 13145, 17578, 20315, 22466, 26290, 40630, 43945, 44693, 56165, 87890, 89386, 112330, 123563, 190961, 223465, 247126, 381922, 446930, 617815, 954805, 1235630, 1909610, 2100571, 4201142, 10502855, 21005710]

約数ペア:

[(1, 21005710), (2, 10502855), (5, 4201142), (10, 2100571), (11, 1909610), (17, 1235630), (22, 954805), (34, 617815), (47, 446930), (55, 381922), (85, 247126), (94, 223465), (110, 190961), (170, 123563), (187, 112330), (235, 89386), (239, 87890), (374, 56165), (470, 44693), (478, 43945), (517, 40630), (799, 26290), (935, 22466), (1034, 20315), (1195, 17578), (1598, 13145), (1870, 11233), (2390, 8789), (2585, 8126), (2629, 7990), (3995, 5258), (4063, 5170)]