21901257

素因数分解:

$3^2\times 7^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1\times {\mathrm{139}}^1$

素因数の和:254

約数の個数: 48

約数和(自身を含む): 37914240

約数和(自身を除く): 16012983

約数列:

[1, 3, 7, 9, 21, 41, 61, 63, 123, 139, 183, 287, 369, 417, 427, 549, 861, 973, 1251, 1281, 2501, 2583, 2919, 3843, 5699, 7503, 8479, 8757, 17097, 17507, 22509, 25437, 39893, 51291, 52521, 59353, 76311, 119679, 157563, 178059, 347639, 359037, 534177, 1042917, 2433473, 3128751, 7300419, 21901257]

約数ペア:

[(1, 21901257), (3, 7300419), (7, 3128751), (9, 2433473), (21, 1042917), (41, 534177), (61, 359037), (63, 347639), (123, 178059), (139, 157563), (183, 119679), (287, 76311), (369, 59353), (417, 52521), (427, 51291), (549, 39893), (861, 25437), (973, 22509), (1251, 17507), (1281, 17097), (2501, 8757), (2583, 8479), (2919, 7503), (3843, 5699)]