20814080

素因数分解:

$2^8\times 5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{101}}^1$

素因数の和:152

約数の個数: 144

約数和(自身を含む): 60044544

約数和(自身を除く): 39230464

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 23, 28, 32, 35, 40, 46, 56, 64, 70, 80, 92, 101, 112, 115, 128, 140, 160, 161, 184, 202, 224, 230, 256, 280, 320, 322, 368, 404, 448, 460, 505, 560, 640, 644, 707, 736, 805, 808, 896, 920, 1010, 1120, 1280, 1288, 1414, 1472, 1610, 1616, 1792, 1840, 2020, 2240, 2323, 2576, 2828, 2944, 3220, 3232, 3535, 3680, 4040, 4480, 4646, 5152, 5656, 5888, 6440, 6464, 7070, 7360, 8080, 8960, 9292, 10304, 11312, 11615, 12880, 12928, 14140, 14720, 16160, 16261, 18584, 20608, 22624, 23230, 25760, 25856, 28280, 29440, 32320, 32522, 37168, 41216, 45248, 46460, 51520, 56560, 64640, 65044, 74336, 81305, 90496, 92920, 103040, 113120, 129280, 130088, 148672, 162610, 180992, 185840, 206080, 226240, 260176, 297344, 325220, 371680, 452480, 520352, 594688, 650440, 743360, 904960, 1040704, 1300880, 1486720, 2081408, 2601760, 2973440, 4162816, 5203520, 10407040, 20814080]

約数ペア:

[(1, 20814080), (2, 10407040), (4, 5203520), (5, 4162816), (7, 2973440), (8, 2601760), (10, 2081408), (14, 1486720), (16, 1300880), (20, 1040704), (23, 904960), (28, 743360), (32, 650440), (35, 594688), (40, 520352), (46, 452480), (56, 371680), (64, 325220), (70, 297344), (80, 260176), (92, 226240), (101, 206080), (112, 185840), (115, 180992), (128, 162610), (140, 148672), (160, 130088), (161, 129280), (184, 113120), (202, 103040), (224, 92920), (230, 90496), (256, 81305), (280, 74336), (320, 65044), (322, 64640), (368, 56560), (404, 51520), (448, 46460), (460, 45248), (505, 41216), (560, 37168), (640, 32522), (644, 32320), (707, 29440), (736, 28280), (805, 25856), (808, 25760), (896, 23230), (920, 22624), (1010, 20608), (1120, 18584), (1280, 16261), (1288, 16160), (1414, 14720), (1472, 14140), (1610, 12928), (1616, 12880), (1792, 11615), (1840, 11312), (2020, 10304), (2240, 9292), (2323, 8960), (2576, 8080), (2828, 7360), (2944, 7070), (3220, 6464), (3232, 6440), (3535, 5888), (3680, 5656), (4040, 5152), (4480, 4646)]