20981125160

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{167}}^1\times {\mathrm{76607}}^1$

素因数の和:76826

約数の個数: 64

約数和(自身を含む): 48649144320

約数和(自身を除く): 27668019160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 167, 205, 328, 334, 410, 668, 820, 835, 1336, 1640, 1670, 3340, 6680, 6847, 13694, 27388, 34235, 54776, 68470, 76607, 136940, 153214, 273880, 306428, 383035, 612856, 766070, 1532140, 3064280, 3140887, 6281774, 12563548, 12793369, 15704435, 25127096, 25586738, 31408870, 51173476, 62817740, 63966845, 102346952, 125635480, 127933690, 255867380, 511734760, 524528129, 1049056258, 2098112516, 2622640645, 4196225032, 5245281290, 10490562580, 20981125160]

約数ペア:

[(1, 20981125160), (2, 10490562580), (4, 5245281290), (5, 4196225032), (8, 2622640645), (10, 2098112516), (20, 1049056258), (40, 524528129), (41, 511734760), (82, 255867380), (164, 127933690), (167, 125635480), (205, 102346952), (328, 63966845), (334, 62817740), (410, 51173476), (668, 31408870), (820, 25586738), (835, 25127096), (1336, 15704435), (1640, 12793369), (1670, 12563548), (3340, 6281774), (6680, 3140887), (6847, 3064280), (13694, 1532140), (27388, 766070), (34235, 612856), (54776, 383035), (68470, 306428), (76607, 273880), (136940, 153214)]