21480880

素因数分解:

$2^4\times 5^1\times {\mathrm{29}}^1\times {\mathrm{47}}^1\times {\mathrm{197}}^1$

素因数の和:286

約数の個数: 80

約数和(自身を含む): 53032320

約数和(自身を除く): 31551440

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 29, 40, 47, 58, 80, 94, 116, 145, 188, 197, 232, 235, 290, 376, 394, 464, 470, 580, 752, 788, 940, 985, 1160, 1363, 1576, 1880, 1970, 2320, 2726, 3152, 3760, 3940, 5452, 5713, 6815, 7880, 9259, 10904, 11426, 13630, 15760, 18518, 21808, 22852, 27260, 28565, 37036, 45704, 46295, 54520, 57130, 74072, 91408, 92590, 109040, 114260, 148144, 185180, 228520, 268511, 370360, 457040, 537022, 740720, 1074044, 1342555, 2148088, 2685110, 4296176, 5370220, 10740440, 21480880]

約数ペア:

[(1, 21480880), (2, 10740440), (4, 5370220), (5, 4296176), (8, 2685110), (10, 2148088), (16, 1342555), (20, 1074044), (29, 740720), (40, 537022), (47, 457040), (58, 370360), (80, 268511), (94, 228520), (116, 185180), (145, 148144), (188, 114260), (197, 109040), (232, 92590), (235, 91408), (290, 74072), (376, 57130), (394, 54520), (464, 46295), (470, 45704), (580, 37036), (752, 28565), (788, 27260), (940, 22852), (985, 21808), (1160, 18518), (1363, 15760), (1576, 13630), (1880, 11426), (1970, 10904), (2320, 9259), (2726, 7880), (3152, 6815), (3760, 5713), (3940, 5452)]