21731355

素因数分解:

$3^3\times 5^1\times {\mathrm{17}}^2\times {\mathrm{557}}^1$

素因数の和:605

約数の個数: 48

約数和(自身を含む): 41113440

約数和(自身を除く): 19382085

約数列:

[1, 3, 5, 9, 15, 17, 27, 45, 51, 85, 135, 153, 255, 289, 459, 557, 765, 867, 1445, 1671, 2295, 2601, 2785, 4335, 5013, 7803, 8355, 9469, 13005, 15039, 25065, 28407, 39015, 47345, 75195, 85221, 142035, 160973, 255663, 426105, 482919, 804865, 1278315, 1448757, 2414595, 4346271, 7243785, 21731355]

約数ペア:

[(1, 21731355), (3, 7243785), (5, 4346271), (9, 2414595), (15, 1448757), (17, 1278315), (27, 804865), (45, 482919), (51, 426105), (85, 255663), (135, 160973), (153, 142035), (255, 85221), (289, 75195), (459, 47345), (557, 39015), (765, 28407), (867, 25065), (1445, 15039), (1671, 13005), (2295, 9469), (2601, 8355), (2785, 7803), (4335, 5013)]