21251139

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{241}}^1$

素因数の和:300

約数の個数: 64

約数和(自身を含む): 39029760

約数和(自身を除く): 17778621

約数列:

[1, 3, 7, 13, 17, 19, 21, 39, 51, 57, 91, 119, 133, 221, 241, 247, 273, 323, 357, 399, 663, 723, 741, 969, 1547, 1687, 1729, 2261, 3133, 4097, 4199, 4579, 4641, 5061, 5187, 6783, 9399, 12291, 12597, 13737, 21931, 28679, 29393, 32053, 53261, 59527, 65793, 77843, 86037, 88179, 96159, 159783, 178581, 233529, 372827, 416689, 544901, 1011959, 1118481, 1250067, 1634703, 3035877, 7083713, 21251139]

約数ペア:

[(1, 21251139), (3, 7083713), (7, 3035877), (13, 1634703), (17, 1250067), (19, 1118481), (21, 1011959), (39, 544901), (51, 416689), (57, 372827), (91, 233529), (119, 178581), (133, 159783), (221, 96159), (241, 88179), (247, 86037), (273, 77843), (323, 65793), (357, 59527), (399, 53261), (663, 32053), (723, 29393), (741, 28679), (969, 21931), (1547, 13737), (1687, 12597), (1729, 12291), (2261, 9399), (3133, 6783), (4097, 5187), (4199, 5061), (4579, 4641)]