20905638

素因数分解:

$2^1\times 3^1\times {\mathrm{13}}^2\times {\mathrm{53}}^1\times {\mathrm{389}}^1$

素因数の和:473

約数の個数: 48

約数和(自身を含む): 46247760

約数和(自身を除く): 25342122

約数列:

[1, 2, 3, 6, 13, 26, 39, 53, 78, 106, 159, 169, 318, 338, 389, 507, 689, 778, 1014, 1167, 1378, 2067, 2334, 4134, 5057, 8957, 10114, 15171, 17914, 20617, 26871, 30342, 41234, 53742, 61851, 65741, 123702, 131482, 197223, 268021, 394446, 536042, 804063, 1608126, 3484273, 6968546, 10452819, 20905638]

約数ペア:

[(1, 20905638), (2, 10452819), (3, 6968546), (6, 3484273), (13, 1608126), (26, 804063), (39, 536042), (53, 394446), (78, 268021), (106, 197223), (159, 131482), (169, 123702), (318, 65741), (338, 61851), (389, 53742), (507, 41234), (689, 30342), (778, 26871), (1014, 20617), (1167, 17914), (1378, 15171), (2067, 10114), (2334, 8957), (4134, 5057)]