21058821

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{73}}^1\times {\mathrm{241}}^1$

素因数の和:346

約数の個数: 48

約数和(自身を含む): 37248640

約数和(自身を除く): 16189819

約数列:

[1, 3, 7, 9, 19, 21, 57, 63, 73, 133, 171, 219, 241, 399, 511, 657, 723, 1197, 1387, 1533, 1687, 2169, 4161, 4579, 4599, 5061, 9709, 12483, 13737, 15183, 17593, 29127, 32053, 41211, 52779, 87381, 96159, 123151, 158337, 288477, 334267, 369453, 1002801, 1108359, 2339869, 3008403, 7019607, 21058821]

約数ペア:

[(1, 21058821), (3, 7019607), (7, 3008403), (9, 2339869), (19, 1108359), (21, 1002801), (57, 369453), (63, 334267), (73, 288477), (133, 158337), (171, 123151), (219, 96159), (241, 87381), (399, 52779), (511, 41211), (657, 32053), (723, 29127), (1197, 17593), (1387, 15183), (1533, 13737), (1687, 12483), (2169, 9709), (4161, 5061), (4579, 4599)]