21000681

素因数分解:

$3^3\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{47}}^1\times {\mathrm{67}}^1$

素因数の和:155

約数の個数: 64

約数和(自身を含む): 36556800

約数和(自身を除く): 15556119

約数列:

[1, 3, 9, 13, 19, 27, 39, 47, 57, 67, 117, 141, 171, 201, 247, 351, 423, 513, 603, 611, 741, 871, 893, 1269, 1273, 1809, 1833, 2223, 2613, 2679, 3149, 3819, 5499, 6669, 7839, 8037, 9447, 11457, 11609, 16497, 16549, 23517, 24111, 28341, 34371, 34827, 40937, 49647, 59831, 85023, 104481, 122811, 148941, 179493, 313443, 368433, 446823, 538479, 777803, 1105299, 1615437, 2333409, 7000227, 21000681]

約数ペア:

[(1, 21000681), (3, 7000227), (9, 2333409), (13, 1615437), (19, 1105299), (27, 777803), (39, 538479), (47, 446823), (57, 368433), (67, 313443), (117, 179493), (141, 148941), (171, 122811), (201, 104481), (247, 85023), (351, 59831), (423, 49647), (513, 40937), (603, 34827), (611, 34371), (741, 28341), (871, 24111), (893, 23517), (1269, 16549), (1273, 16497), (1809, 11609), (1833, 11457), (2223, 9447), (2613, 8037), (2679, 7839), (3149, 6669), (3819, 5499)]