20917708

素因数分解:

$2^2\times 7^2\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{137}}^1$

素因数の和:215

約数の個数: 72

約数和(自身を含む): 46252080

約数和(自身を除く): 25334372

約数列:

[1, 2, 4, 7, 14, 19, 28, 38, 41, 49, 76, 82, 98, 133, 137, 164, 196, 266, 274, 287, 532, 548, 574, 779, 931, 959, 1148, 1558, 1862, 1918, 2009, 2603, 3116, 3724, 3836, 4018, 5206, 5453, 5617, 6713, 8036, 10412, 10906, 11234, 13426, 18221, 21812, 22468, 26852, 36442, 38171, 39319, 72884, 76342, 78638, 106723, 127547, 152684, 157276, 213446, 255094, 275233, 426892, 510188, 550466, 747061, 1100932, 1494122, 2988244, 5229427, 10458854, 20917708]

約数ペア:

[(1, 20917708), (2, 10458854), (4, 5229427), (7, 2988244), (14, 1494122), (19, 1100932), (28, 747061), (38, 550466), (41, 510188), (49, 426892), (76, 275233), (82, 255094), (98, 213446), (133, 157276), (137, 152684), (164, 127547), (196, 106723), (266, 78638), (274, 76342), (287, 72884), (532, 39319), (548, 38171), (574, 36442), (779, 26852), (931, 22468), (959, 21812), (1148, 18221), (1558, 13426), (1862, 11234), (1918, 10906), (2009, 10412), (2603, 8036), (3116, 6713), (3724, 5617), (3836, 5453), (4018, 5206)]