21316720

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{67}}^1\times {\mathrm{97}}^1$

素因数の和:218

約数の個数: 80

約数和(自身を含む): 52059168

約数和(自身を除く): 30742448

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 67, 80, 82, 97, 134, 164, 194, 205, 268, 328, 335, 388, 410, 485, 536, 656, 670, 776, 820, 970, 1072, 1340, 1552, 1640, 1940, 2680, 2747, 3280, 3880, 3977, 5360, 5494, 6499, 7760, 7954, 10988, 12998, 13735, 15908, 19885, 21976, 25996, 27470, 31816, 32495, 39770, 43952, 51992, 54940, 63632, 64990, 79540, 103984, 109880, 129980, 159080, 219760, 259960, 266459, 318160, 519920, 532918, 1065836, 1332295, 2131672, 2664590, 4263344, 5329180, 10658360, 21316720]

約数ペア:

[(1, 21316720), (2, 10658360), (4, 5329180), (5, 4263344), (8, 2664590), (10, 2131672), (16, 1332295), (20, 1065836), (40, 532918), (41, 519920), (67, 318160), (80, 266459), (82, 259960), (97, 219760), (134, 159080), (164, 129980), (194, 109880), (205, 103984), (268, 79540), (328, 64990), (335, 63632), (388, 54940), (410, 51992), (485, 43952), (536, 39770), (656, 32495), (670, 31816), (776, 27470), (820, 25996), (970, 21976), (1072, 19885), (1340, 15908), (1552, 13735), (1640, 12998), (1940, 10988), (2680, 7954), (2747, 7760), (3280, 6499), (3880, 5494), (3977, 5360)]