21213765

素因数分解:

$3^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{137}}^1$

素因数の和:219

約数の個数: 64

約数和(自身を含む): 40273920

約数和(自身を除く): 19060155

約数列:

[1, 3, 5, 9, 15, 27, 31, 37, 45, 93, 111, 135, 137, 155, 185, 279, 333, 411, 465, 555, 685, 837, 999, 1147, 1233, 1395, 1665, 2055, 3441, 3699, 4185, 4247, 4995, 5069, 5735, 6165, 10323, 12741, 15207, 17205, 18495, 21235, 25345, 30969, 38223, 45621, 51615, 63705, 76035, 114669, 136863, 154845, 157139, 191115, 228105, 471417, 573345, 684315, 785695, 1414251, 2357085, 4242753, 7071255, 21213765]

約数ペア:

[(1, 21213765), (3, 7071255), (5, 4242753), (9, 2357085), (15, 1414251), (27, 785695), (31, 684315), (37, 573345), (45, 471417), (93, 228105), (111, 191115), (135, 157139), (137, 154845), (155, 136863), (185, 114669), (279, 76035), (333, 63705), (411, 51615), (465, 45621), (555, 38223), (685, 30969), (837, 25345), (999, 21235), (1147, 18495), (1233, 17205), (1395, 15207), (1665, 12741), (2055, 10323), (3441, 6165), (3699, 5735), (4185, 5069), (4247, 4995)]