21507705

素因数分解:

$3^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{16481}}^1$

素因数の和:16521

約数の個数: 24

約数和(自身を含む): 38567880

約数和(自身を除く): 17060175

約数列:

[1, 3, 5, 9, 15, 29, 45, 87, 145, 261, 435, 1305, 16481, 49443, 82405, 148329, 247215, 477949, 741645, 1433847, 2389745, 4301541, 7169235, 21507705]

約数ペア:

[(1, 21507705), (3, 7169235), (5, 4301541), (9, 2389745), (15, 1433847), (29, 741645), (45, 477949), (87, 247215), (145, 148329), (261, 82405), (435, 49443), (1305, 16481)]