21280004

素因数分解:

$2^2\times {\mathrm{67}}^1\times {\mathrm{271}}^1\times {\mathrm{293}}^1$

素因数の和:635

約数の個数: 24

約数和(自身を含む): 38064768

約数和(自身を除く): 16784764

約数列:

[1, 2, 4, 67, 134, 268, 271, 293, 542, 586, 1084, 1172, 18157, 19631, 36314, 39262, 72628, 78524, 79403, 158806, 317612, 5320001, 10640002, 21280004]

約数ペア:

[(1, 21280004), (2, 10640002), (4, 5320001), (67, 317612), (134, 158806), (268, 79403), (271, 78524), (293, 72628), (542, 39262), (586, 36314), (1084, 19631), (1172, 18157)]