21311505

素因数分解:

$3^4\times 5^1\times {\mathrm{101}}^1\times {\mathrm{521}}^1$

素因数の和:639

約数の個数: 40

約数和(自身を含む): 38655144

約数和(自身を除く): 17343639

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 101, 135, 303, 405, 505, 521, 909, 1515, 1563, 2605, 2727, 4545, 4689, 7815, 8181, 13635, 14067, 23445, 40905, 42201, 52621, 70335, 157863, 211005, 263105, 473589, 789315, 1420767, 2367945, 4262301, 7103835, 21311505]

約数ペア:

[(1, 21311505), (3, 7103835), (5, 4262301), (9, 2367945), (15, 1420767), (27, 789315), (45, 473589), (81, 263105), (101, 211005), (135, 157863), (303, 70335), (405, 52621), (505, 42201), (521, 40905), (909, 23445), (1515, 14067), (1563, 13635), (2605, 8181), (2727, 7815), (4545, 4689)]