21604705

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{257}}^1$

素因数の和:345

約数の個数: 32

約数和(自身を含む): 29424384

約数和(自身を除く): 7819679

約数列:

[1, 5, 17, 23, 43, 85, 115, 215, 257, 391, 731, 989, 1285, 1955, 3655, 4369, 4945, 5911, 11051, 16813, 21845, 29555, 55255, 84065, 100487, 187867, 254173, 502435, 939335, 1270865, 4320941, 21604705]

約数ペア:

[(1, 21604705), (5, 4320941), (17, 1270865), (23, 939335), (43, 502435), (85, 254173), (115, 187867), (215, 100487), (257, 84065), (391, 55255), (731, 29555), (989, 21845), (1285, 16813), (1955, 11051), (3655, 5911), (4369, 4945)]