20865663

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{73}}^1\times {\mathrm{349}}^1$

素因数の和:448

約数の個数: 48

約数和(自身を含む): 37710400

約数和(自身を除く): 16844737

約数列:

[1, 3, 7, 9, 13, 21, 39, 63, 73, 91, 117, 219, 273, 349, 511, 657, 819, 949, 1047, 1533, 2443, 2847, 3141, 4537, 4599, 6643, 7329, 8541, 13611, 19929, 21987, 25477, 31759, 40833, 59787, 76431, 95277, 178339, 229293, 285831, 331201, 535017, 993603, 1605051, 2318407, 2980809, 6955221, 20865663]

約数ペア:

[(1, 20865663), (3, 6955221), (7, 2980809), (9, 2318407), (13, 1605051), (21, 993603), (39, 535017), (63, 331201), (73, 285831), (91, 229293), (117, 178339), (219, 95277), (273, 76431), (349, 59787), (511, 40833), (657, 31759), (819, 25477), (949, 21987), (1047, 19929), (1533, 13611), (2443, 8541), (2847, 7329), (3141, 6643), (4537, 4599)]