21990969

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{2441}}^1$

素因数の和:2478

約数の個数: 48

約数和(自身を含む): 42666624

約数和(自身を除く): 20675655

約数列:

[1, 3, 7, 9, 11, 13, 21, 33, 39, 63, 77, 91, 99, 117, 143, 231, 273, 429, 693, 819, 1001, 1287, 2441, 3003, 7323, 9009, 17087, 21969, 26851, 31733, 51261, 80553, 95199, 153783, 187957, 222131, 241659, 285597, 349063, 563871, 666393, 1047189, 1691613, 1999179, 2443441, 3141567, 7330323, 21990969]

約数ペア:

[(1, 21990969), (3, 7330323), (7, 3141567), (9, 2443441), (11, 1999179), (13, 1691613), (21, 1047189), (33, 666393), (39, 563871), (63, 349063), (77, 285597), (91, 241659), (99, 222131), (117, 187957), (143, 153783), (231, 95199), (273, 80553), (429, 51261), (693, 31733), (819, 26851), (1001, 21969), (1287, 17087), (2441, 9009), (3003, 7323)]