20689425

素因数分解:

$3^4\times 5^2\times {\mathrm{17}}^1\times {\mathrm{601}}^1$

素因数の和:640

約数の個数: 60

約数和(自身を含む): 40645836

約数和(自身を除く): 19956411

約数列:

[1, 3, 5, 9, 15, 17, 25, 27, 45, 51, 75, 81, 85, 135, 153, 225, 255, 405, 425, 459, 601, 675, 765, 1275, 1377, 1803, 2025, 2295, 3005, 3825, 5409, 6885, 9015, 10217, 11475, 15025, 16227, 27045, 30651, 34425, 45075, 48681, 51085, 81135, 91953, 135225, 153255, 243405, 255425, 275859, 405675, 459765, 766275, 827577, 1217025, 1379295, 2298825, 4137885, 6896475, 20689425]

約数ペア:

[(1, 20689425), (3, 6896475), (5, 4137885), (9, 2298825), (15, 1379295), (17, 1217025), (25, 827577), (27, 766275), (45, 459765), (51, 405675), (75, 275859), (81, 255425), (85, 243405), (135, 153255), (153, 135225), (225, 91953), (255, 81135), (405, 51085), (425, 48681), (459, 45075), (601, 34425), (675, 30651), (765, 27045), (1275, 16227), (1377, 15025), (1803, 11475), (2025, 10217), (2295, 9015), (3005, 6885), (3825, 5409)]