20965995

素因数分解:

$3^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{431}}^1$

素因数の和:512

約数の個数: 48

約数和(自身を含む): 38817792

約数和(自身を除く): 17851797

約数列:

[1, 3, 5, 9, 15, 23, 45, 47, 69, 115, 141, 207, 235, 345, 423, 431, 705, 1035, 1081, 1293, 2115, 2155, 3243, 3879, 5405, 6465, 9729, 9913, 16215, 19395, 20257, 29739, 48645, 49565, 60771, 89217, 101285, 148695, 182313, 303855, 446085, 465911, 911565, 1397733, 2329555, 4193199, 6988665, 20965995]

約数ペア:

[(1, 20965995), (3, 6988665), (5, 4193199), (9, 2329555), (15, 1397733), (23, 911565), (45, 465911), (47, 446085), (69, 303855), (115, 182313), (141, 148695), (207, 101285), (235, 89217), (345, 60771), (423, 49565), (431, 48645), (705, 29739), (1035, 20257), (1081, 19395), (1293, 16215), (2115, 9913), (2155, 9729), (3243, 6465), (3879, 5405)]