21391155

素因数分解:

$3^3\times 5^1\times {\mathrm{193}}^1\times {\mathrm{821}}^1$

素因数の和:1028

約数の個数: 32

約数和(自身を含む): 38272320

約数和(自身を除く): 16881165

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 193, 579, 821, 965, 1737, 2463, 2895, 4105, 5211, 7389, 8685, 12315, 22167, 26055, 36945, 110835, 158453, 475359, 792265, 1426077, 2376795, 4278231, 7130385, 21391155]

約数ペア:

[(1, 21391155), (3, 7130385), (5, 4278231), (9, 2376795), (15, 1426077), (27, 792265), (45, 475359), (135, 158453), (193, 110835), (579, 36945), (821, 26055), (965, 22167), (1737, 12315), (2463, 8685), (2895, 7389), (4105, 5211)]