21651705

素因数分解:

$3^4\times 5^1\times {\mathrm{193}}^1\times {\mathrm{277}}^1$

素因数の和:487

約数の個数: 40

約数和(自身を含む): 39154632

約数和(自身を除く): 17502927

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 193, 277, 405, 579, 831, 965, 1385, 1737, 2493, 2895, 4155, 5211, 7479, 8685, 12465, 15633, 22437, 26055, 37395, 53461, 78165, 112185, 160383, 267305, 481149, 801915, 1443447, 2405745, 4330341, 7217235, 21651705]

約数ペア:

[(1, 21651705), (3, 7217235), (5, 4330341), (9, 2405745), (15, 1443447), (27, 801915), (45, 481149), (81, 267305), (135, 160383), (193, 112185), (277, 78165), (405, 53461), (579, 37395), (831, 26055), (965, 22437), (1385, 15633), (1737, 12465), (2493, 8685), (2895, 7479), (4155, 5211)]