21303945

素因数分解:

$3^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{199}}^1$

素因数の和:287

約数の個数: 64

約数和(自身を含む): 41664000

約数和(自身を除く): 20360055

約数列:

[1, 3, 5, 9, 13, 15, 27, 39, 45, 61, 65, 117, 135, 183, 195, 199, 305, 351, 549, 585, 597, 793, 915, 995, 1647, 1755, 1791, 2379, 2587, 2745, 2985, 3965, 5373, 7137, 7761, 8235, 8955, 11895, 12139, 12935, 21411, 23283, 26865, 35685, 36417, 38805, 60695, 69849, 107055, 109251, 116415, 157807, 182085, 327753, 349245, 473421, 546255, 789035, 1420263, 1638765, 2367105, 4260789, 7101315, 21303945]

約数ペア:

[(1, 21303945), (3, 7101315), (5, 4260789), (9, 2367105), (13, 1638765), (15, 1420263), (27, 789035), (39, 546255), (45, 473421), (61, 349245), (65, 327753), (117, 182085), (135, 157807), (183, 116415), (195, 109251), (199, 107055), (305, 69849), (351, 60695), (549, 38805), (585, 36417), (597, 35685), (793, 26865), (915, 23283), (995, 21411), (1647, 12935), (1755, 12139), (1791, 11895), (2379, 8955), (2587, 8235), (2745, 7761), (2985, 7137), (3965, 5373)]