20921467

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{199}}^1\times {\mathrm{653}}^1$

素因数の和:882

約数の個数: 16

約数和(自身を含む): 25113600

約数和(自身を除く): 4192133

約数列:

[1, 7, 23, 161, 199, 653, 1393, 4571, 4577, 15019, 32039, 105133, 129947, 909629, 2988781, 20921467]

約数ペア:

[(1, 20921467), (7, 2988781), (23, 909629), (161, 129947), (199, 105133), (653, 32039), (1393, 15019), (4571, 4577)]