21708135

素因数分解:

$3^3\times 5^1\times {\mathrm{401}}^2$

素因数の和:816

約数の個数: 24

約数和(自身を含む): 38688720

約数和(自身を除く): 16980585

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 401, 1203, 2005, 3609, 6015, 10827, 18045, 54135, 160801, 482403, 804005, 1447209, 2412015, 4341627, 7236045, 21708135]

約数ペア:

[(1, 21708135), (3, 7236045), (5, 4341627), (9, 2412015), (15, 1447209), (27, 804005), (45, 482403), (135, 160801), (401, 54135), (1203, 18045), (2005, 10827), (3609, 6015)]