21039004

素因数分解:

$2^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{71}}^1\times {\mathrm{557}}^1$

素因数の和:658

約数の個数: 48

約数和(自身を含む): 44997120

約数和(自身を除く): 23958116

約数列:

[1, 2, 4, 7, 14, 19, 28, 38, 71, 76, 133, 142, 266, 284, 497, 532, 557, 994, 1114, 1349, 1988, 2228, 2698, 3899, 5396, 7798, 9443, 10583, 15596, 18886, 21166, 37772, 39547, 42332, 74081, 79094, 148162, 158188, 276829, 296324, 553658, 751393, 1107316, 1502786, 3005572, 5259751, 10519502, 21039004]

約数ペア:

[(1, 21039004), (2, 10519502), (4, 5259751), (7, 3005572), (14, 1502786), (19, 1107316), (28, 751393), (38, 553658), (71, 296324), (76, 276829), (133, 158188), (142, 148162), (266, 79094), (284, 74081), (497, 42332), (532, 39547), (557, 37772), (994, 21166), (1114, 18886), (1349, 15596), (1988, 10583), (2228, 9443), (2698, 7798), (3899, 5396)]