21219705

素因数分解:

$3^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{107}}^1\times {\mathrm{113}}^1$

素因数の和:247

約数の個数: 64

約数和(自身を含む): 41368320

約数和(自身を除く): 20148615

約数列:

[1, 3, 5, 9, 13, 15, 27, 39, 45, 65, 107, 113, 117, 135, 195, 321, 339, 351, 535, 565, 585, 963, 1017, 1391, 1469, 1605, 1695, 1755, 2889, 3051, 4173, 4407, 4815, 5085, 6955, 7345, 12091, 12519, 13221, 14445, 15255, 20865, 22035, 36273, 37557, 39663, 60455, 62595, 66105, 108819, 157183, 181365, 187785, 198315, 326457, 471549, 544095, 785915, 1414647, 1632285, 2357745, 4243941, 7073235, 21219705]

約数ペア:

[(1, 21219705), (3, 7073235), (5, 4243941), (9, 2357745), (13, 1632285), (15, 1414647), (27, 785915), (39, 544095), (45, 471549), (65, 326457), (107, 198315), (113, 187785), (117, 181365), (135, 157183), (195, 108819), (321, 66105), (339, 62595), (351, 60455), (535, 39663), (565, 37557), (585, 36273), (963, 22035), (1017, 20865), (1391, 15255), (1469, 14445), (1605, 13221), (1695, 12519), (1755, 12091), (2889, 7345), (3051, 6955), (4173, 5085), (4407, 4815)]