21078904

素因数分解:

$2^3\times 7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{1801}}^1$

素因数の和:1844

約数の個数: 64

約数和(自身を含む): 51897600

約数和(自身を除く): 30818696

約数列:

[1, 2, 4, 7, 8, 11, 14, 19, 22, 28, 38, 44, 56, 76, 77, 88, 133, 152, 154, 209, 266, 308, 418, 532, 616, 836, 1064, 1463, 1672, 1801, 2926, 3602, 5852, 7204, 11704, 12607, 14408, 19811, 25214, 34219, 39622, 50428, 68438, 79244, 100856, 136876, 138677, 158488, 239533, 273752, 277354, 376409, 479066, 554708, 752818, 958132, 1109416, 1505636, 1916264, 2634863, 3011272, 5269726, 10539452, 21078904]

約数ペア:

[(1, 21078904), (2, 10539452), (4, 5269726), (7, 3011272), (8, 2634863), (11, 1916264), (14, 1505636), (19, 1109416), (22, 958132), (28, 752818), (38, 554708), (44, 479066), (56, 376409), (76, 277354), (77, 273752), (88, 239533), (133, 158488), (152, 138677), (154, 136876), (209, 100856), (266, 79244), (308, 68438), (418, 50428), (532, 39622), (616, 34219), (836, 25214), (1064, 19811), (1463, 14408), (1672, 12607), (1801, 11704), (2926, 7204), (3602, 5852)]