21178005

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{1567}}^1$

素因数の和:1645

約数の個数: 32

約数和(自身を含む): 36578304

約数和(自身を除く): 15400299

約数列:

[1, 3, 5, 15, 17, 51, 53, 85, 159, 255, 265, 795, 901, 1567, 2703, 4505, 4701, 7835, 13515, 23505, 26639, 79917, 83051, 133195, 249153, 399585, 415255, 1245765, 1411867, 4235601, 7059335, 21178005]

約数ペア:

[(1, 21178005), (3, 7059335), (5, 4235601), (15, 1411867), (17, 1245765), (51, 415255), (53, 399585), (85, 249153), (159, 133195), (255, 83051), (265, 79917), (795, 26639), (901, 23505), (1567, 13515), (2703, 7835), (4505, 4701)]