21904587

素因数分解:

$3^4\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{331}}^1$

素因数の和:405

約数の個数: 40

約数和(自身を含む): 35351360

約数和(自身を除く): 13446773

約数列:

[1, 3, 9, 19, 27, 43, 57, 81, 129, 171, 331, 387, 513, 817, 993, 1161, 1539, 2451, 2979, 3483, 6289, 7353, 8937, 14233, 18867, 22059, 26811, 42699, 56601, 66177, 128097, 169803, 270427, 384291, 509409, 811281, 1152873, 2433843, 7301529, 21904587]

約数ペア:

[(1, 21904587), (3, 7301529), (9, 2433843), (19, 1152873), (27, 811281), (43, 509409), (57, 384291), (81, 270427), (129, 169803), (171, 128097), (331, 66177), (387, 56601), (513, 42699), (817, 26811), (993, 22059), (1161, 18867), (1539, 14233), (2451, 8937), (2979, 7353), (3483, 6289)]