20815905

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{181}}^1$

素因数の和:258

約数の個数: 64

約数和(自身を含む): 39626496

約数和(自身を除く): 18810591

約数列:

[1, 3, 5, 11, 15, 17, 33, 41, 51, 55, 85, 123, 165, 181, 187, 205, 255, 451, 543, 561, 615, 697, 905, 935, 1353, 1991, 2091, 2255, 2715, 2805, 3077, 3485, 5973, 6765, 7421, 7667, 9231, 9955, 10455, 15385, 22263, 23001, 29865, 33847, 37105, 38335, 46155, 81631, 101541, 111315, 115005, 126157, 169235, 244893, 378471, 408155, 507705, 630785, 1224465, 1387727, 1892355, 4163181, 6938635, 20815905]

約数ペア:

[(1, 20815905), (3, 6938635), (5, 4163181), (11, 1892355), (15, 1387727), (17, 1224465), (33, 630785), (41, 507705), (51, 408155), (55, 378471), (85, 244893), (123, 169235), (165, 126157), (181, 115005), (187, 111315), (205, 101541), (255, 81631), (451, 46155), (543, 38335), (561, 37105), (615, 33847), (697, 29865), (905, 23001), (935, 22263), (1353, 15385), (1991, 10455), (2091, 9955), (2255, 9231), (2715, 7667), (2805, 7421), (3077, 6765), (3485, 5973)]