21520425

素因数分解:

$3^1\times 5^2\times {\mathrm{43}}^1\times {\mathrm{6673}}^1$

素因数の和:6729

約数の個数: 24

約数和(自身を含む): 36413344

約数和(自身を除く): 14892919

約数列:

[1, 3, 5, 15, 25, 43, 75, 129, 215, 645, 1075, 3225, 6673, 20019, 33365, 100095, 166825, 286939, 500475, 860817, 1434695, 4304085, 7173475, 21520425]

約数ペア:

[(1, 21520425), (3, 7173475), (5, 4304085), (15, 1434695), (25, 860817), (43, 500475), (75, 286939), (129, 166825), (215, 100095), (645, 33365), (1075, 20019), (3225, 6673)]