18920680

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{83}}^1\times {\mathrm{139}}^1$

素因数の和:274

約数の個数: 64

約数和(自身を含む): 44452800

約数和(自身を除く): 25532120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 83, 139, 164, 166, 205, 278, 328, 332, 410, 415, 556, 664, 695, 820, 830, 1112, 1390, 1640, 1660, 2780, 3320, 3403, 5560, 5699, 6806, 11398, 11537, 13612, 17015, 22796, 23074, 27224, 28495, 34030, 45592, 46148, 56990, 57685, 68060, 92296, 113980, 115370, 136120, 227960, 230740, 461480, 473017, 946034, 1892068, 2365085, 3784136, 4730170, 9460340, 18920680]

約数ペア:

[(1, 18920680), (2, 9460340), (4, 4730170), (5, 3784136), (8, 2365085), (10, 1892068), (20, 946034), (40, 473017), (41, 461480), (82, 230740), (83, 227960), (139, 136120), (164, 115370), (166, 113980), (205, 92296), (278, 68060), (328, 57685), (332, 56990), (410, 46148), (415, 45592), (556, 34030), (664, 28495), (695, 27224), (820, 23074), (830, 22796), (1112, 17015), (1390, 13612), (1640, 11537), (1660, 11398), (2780, 6806), (3320, 5699), (3403, 5560)]