20855380

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{1637}}^1$

素因数の和:1673

約数の個数: 72

約数和(自身を含む): 54899208

約数和(自身を除く): 34043828

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 49, 52, 65, 70, 91, 98, 130, 140, 182, 196, 245, 260, 364, 455, 490, 637, 910, 980, 1274, 1637, 1820, 2548, 3185, 3274, 6370, 6548, 8185, 11459, 12740, 16370, 21281, 22918, 32740, 42562, 45836, 57295, 80213, 85124, 106405, 114590, 148967, 160426, 212810, 229180, 297934, 320852, 401065, 425620, 595868, 744835, 802130, 1042769, 1489670, 1604260, 2085538, 2979340, 4171076, 5213845, 10427690, 20855380]

約数ペア:

[(1, 20855380), (2, 10427690), (4, 5213845), (5, 4171076), (7, 2979340), (10, 2085538), (13, 1604260), (14, 1489670), (20, 1042769), (26, 802130), (28, 744835), (35, 595868), (49, 425620), (52, 401065), (65, 320852), (70, 297934), (91, 229180), (98, 212810), (130, 160426), (140, 148967), (182, 114590), (196, 106405), (245, 85124), (260, 80213), (364, 57295), (455, 45836), (490, 42562), (637, 32740), (910, 22918), (980, 21281), (1274, 16370), (1637, 12740), (1820, 11459), (2548, 8185), (3185, 6548), (3274, 6370)]