20480720

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{419}}^1$

素因数の和:492

約数の個数: 80

約数和(自身を含む): 52496640

約数和(自身を除く): 32015920

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 47, 52, 65, 80, 94, 104, 130, 188, 208, 235, 260, 376, 419, 470, 520, 611, 752, 838, 940, 1040, 1222, 1676, 1880, 2095, 2444, 3055, 3352, 3760, 4190, 4888, 5447, 6110, 6704, 8380, 9776, 10894, 12220, 16760, 19693, 21788, 24440, 27235, 33520, 39386, 43576, 48880, 54470, 78772, 87152, 98465, 108940, 157544, 196930, 217880, 256009, 315088, 393860, 435760, 512018, 787720, 1024036, 1280045, 1575440, 2048072, 2560090, 4096144, 5120180, 10240360, 20480720]

約数ペア:

[(1, 20480720), (2, 10240360), (4, 5120180), (5, 4096144), (8, 2560090), (10, 2048072), (13, 1575440), (16, 1280045), (20, 1024036), (26, 787720), (40, 512018), (47, 435760), (52, 393860), (65, 315088), (80, 256009), (94, 217880), (104, 196930), (130, 157544), (188, 108940), (208, 98465), (235, 87152), (260, 78772), (376, 54470), (419, 48880), (470, 43576), (520, 39386), (611, 33520), (752, 27235), (838, 24440), (940, 21788), (1040, 19693), (1222, 16760), (1676, 12220), (1880, 10894), (2095, 9776), (2444, 8380), (3055, 6704), (3352, 6110), (3760, 5447), (4190, 4888)]