21020391

素因数分解:

$3^4\times 7^1\times {\mathrm{131}}^1\times {\mathrm{283}}^1$

素因数の和:433

約数の個数: 40

約数和(自身を含む): 36288384

約数和(自身を除く): 15267993

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 131, 189, 283, 393, 567, 849, 917, 1179, 1981, 2547, 2751, 3537, 5943, 7641, 8253, 10611, 17829, 22923, 24759, 37073, 53487, 74277, 111219, 160461, 259511, 333657, 778533, 1000971, 2335599, 3002913, 7006797, 21020391]

約数ペア:

[(1, 21020391), (3, 7006797), (7, 3002913), (9, 2335599), (21, 1000971), (27, 778533), (63, 333657), (81, 259511), (131, 160461), (189, 111219), (283, 74277), (393, 53487), (567, 37073), (849, 24759), (917, 22923), (1179, 17829), (1981, 10611), (2547, 8253), (2751, 7641), (3537, 5943)]