21019225

素因数分解:

$5^2\times {\mathrm{17}}^1\times {\mathrm{19}}^2\times {\mathrm{137}}^1$

素因数の和:202

約数の個数: 36

約数和(自身を含む): 29338524

約数和(自身を除く): 8319299

約数列:

[1, 5, 17, 19, 25, 85, 95, 137, 323, 361, 425, 475, 685, 1615, 1805, 2329, 2603, 3425, 6137, 8075, 9025, 11645, 13015, 30685, 44251, 49457, 58225, 65075, 153425, 221255, 247285, 840769, 1106275, 1236425, 4203845, 21019225]

約数ペア:

[(1, 21019225), (5, 4203845), (17, 1236425), (19, 1106275), (25, 840769), (85, 247285), (95, 221255), (137, 153425), (323, 65075), (361, 58225), (425, 49457), (475, 44251), (685, 30685), (1615, 13015), (1805, 11645), (2329, 9025), (2603, 8075), (3425, 6137)]