21377755

素因数分解:

$5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1$

素因数の和:140

約数の個数: 64

約数和(自身を含む): 34283520

約数和(自身を除く): 12905765

約数列:

[1, 5, 7, 17, 19, 31, 35, 61, 85, 95, 119, 133, 155, 217, 305, 323, 427, 527, 589, 595, 665, 1037, 1085, 1159, 1615, 1891, 2135, 2261, 2635, 2945, 3689, 4123, 5185, 5795, 7259, 8113, 9455, 10013, 11305, 13237, 18445, 19703, 20615, 32147, 35929, 36295, 40565, 50065, 66185, 70091, 98515, 137921, 160735, 179645, 225029, 251503, 350455, 610793, 689605, 1125145, 1257515, 3053965, 4275551, 21377755]

約数ペア:

[(1, 21377755), (5, 4275551), (7, 3053965), (17, 1257515), (19, 1125145), (31, 689605), (35, 610793), (61, 350455), (85, 251503), (95, 225029), (119, 179645), (133, 160735), (155, 137921), (217, 98515), (305, 70091), (323, 66185), (427, 50065), (527, 40565), (589, 36295), (595, 35929), (665, 32147), (1037, 20615), (1085, 19703), (1159, 18445), (1615, 13237), (1891, 11305), (2135, 10013), (2261, 9455), (2635, 8113), (2945, 7259), (3689, 5795), (4123, 5185)]