21690405

素因数分解:

$3^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{1511}}^1$

素因数の和:1562

約数の個数: 48

約数和(自身を含む): 42456960

約数和(自身を除く): 20766555

約数列:

[1, 3, 5, 9, 11, 15, 29, 33, 45, 55, 87, 99, 145, 165, 261, 319, 435, 495, 957, 1305, 1511, 1595, 2871, 4533, 4785, 7555, 13599, 14355, 16621, 22665, 43819, 49863, 67995, 83105, 131457, 149589, 219095, 249315, 394371, 482009, 657285, 747945, 1446027, 1971855, 2410045, 4338081, 7230135, 21690405]

約数ペア:

[(1, 21690405), (3, 7230135), (5, 4338081), (9, 2410045), (11, 1971855), (15, 1446027), (29, 747945), (33, 657285), (45, 482009), (55, 394371), (87, 249315), (99, 219095), (145, 149589), (165, 131457), (261, 83105), (319, 67995), (435, 49863), (495, 43819), (957, 22665), (1305, 16621), (1511, 14355), (1595, 13599), (2871, 7555), (4533, 4785)]