21273993

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{349}}^1\times {\mathrm{521}}^1$

素因数の和:889

約数の個数: 24

約数和(自身を含む): 33251400

約数和(自身を除く): 11977407

約数列:

[1, 3, 9, 13, 39, 117, 349, 521, 1047, 1563, 3141, 4537, 4689, 6773, 13611, 20319, 40833, 60957, 181829, 545487, 1636461, 2363777, 7091331, 21273993]

約数ペア:

[(1, 21273993), (3, 7091331), (9, 2363777), (13, 1636461), (39, 545487), (117, 181829), (349, 60957), (521, 40833), (1047, 20319), (1563, 13611), (3141, 6773), (4537, 4689)]