20984920

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{1289}}^1$

素因数の和:1348

約数の個数: 64

約数和(自身を含む): 52941600

約数和(自身を除く): 31956680

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 37, 40, 44, 55, 74, 88, 110, 148, 185, 220, 296, 370, 407, 440, 740, 814, 1289, 1480, 1628, 2035, 2578, 3256, 4070, 5156, 6445, 8140, 10312, 12890, 14179, 16280, 25780, 28358, 47693, 51560, 56716, 70895, 95386, 113432, 141790, 190772, 238465, 283580, 381544, 476930, 524623, 567160, 953860, 1049246, 1907720, 2098492, 2623115, 4196984, 5246230, 10492460, 20984920]

約数ペア:

[(1, 20984920), (2, 10492460), (4, 5246230), (5, 4196984), (8, 2623115), (10, 2098492), (11, 1907720), (20, 1049246), (22, 953860), (37, 567160), (40, 524623), (44, 476930), (55, 381544), (74, 283580), (88, 238465), (110, 190772), (148, 141790), (185, 113432), (220, 95386), (296, 70895), (370, 56716), (407, 51560), (440, 47693), (740, 28358), (814, 25780), (1289, 16280), (1480, 14179), (1628, 12890), (2035, 10312), (2578, 8140), (3256, 6445), (4070, 5156)]