21209643

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{47}}^1$

素因数の和:121

約数の個数: 96

約数和(自身を含む): 41932800

約数和(自身を除く): 20723157

約数列:

[1, 3, 7, 9, 13, 19, 21, 29, 39, 47, 57, 63, 87, 91, 117, 133, 141, 171, 203, 247, 261, 273, 329, 377, 399, 423, 551, 609, 611, 741, 819, 893, 987, 1131, 1197, 1363, 1653, 1729, 1827, 1833, 2223, 2639, 2679, 2961, 3393, 3857, 4089, 4277, 4959, 5187, 5499, 6251, 7163, 7917, 8037, 9541, 11571, 11609, 12267, 12831, 15561, 17719, 18753, 21489, 23751, 25897, 28623, 34713, 34827, 38493, 50141, 53157, 56259, 64467, 77691, 81263, 85869, 104481, 124033, 150423, 159471, 181279, 233073, 243789, 336661, 372099, 451269, 543837, 731367, 1009983, 1116297, 1631511, 2356627, 3029949, 7069881, 21209643]

約数ペア:

[(1, 21209643), (3, 7069881), (7, 3029949), (9, 2356627), (13, 1631511), (19, 1116297), (21, 1009983), (29, 731367), (39, 543837), (47, 451269), (57, 372099), (63, 336661), (87, 243789), (91, 233073), (117, 181279), (133, 159471), (141, 150423), (171, 124033), (203, 104481), (247, 85869), (261, 81263), (273, 77691), (329, 64467), (377, 56259), (399, 53157), (423, 50141), (551, 38493), (609, 34827), (611, 34713), (741, 28623), (819, 25897), (893, 23751), (987, 21489), (1131, 18753), (1197, 17719), (1363, 15561), (1653, 12831), (1729, 12267), (1827, 11609), (1833, 11571), (2223, 9541), (2639, 8037), (2679, 7917), (2961, 7163), (3393, 6251), (3857, 5499), (4089, 5187), (4277, 4959)]