20408465

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^2\times {\mathrm{61}}^1\times {\mathrm{79}}^1$

素因数の和:174

約数の個数: 48

約数和(自身を含む): 31664640

約数和(自身を除く): 11256175

約数列:

[1, 5, 7, 11, 35, 55, 61, 77, 79, 121, 305, 385, 395, 427, 553, 605, 671, 847, 869, 2135, 2765, 3355, 4235, 4345, 4697, 4819, 6083, 7381, 9559, 23485, 24095, 30415, 33733, 36905, 47795, 51667, 53009, 66913, 168665, 258335, 265045, 334565, 371063, 583099, 1855315, 2915495, 4081693, 20408465]

約数ペア:

[(1, 20408465), (5, 4081693), (7, 2915495), (11, 1855315), (35, 583099), (55, 371063), (61, 334565), (77, 265045), (79, 258335), (121, 168665), (305, 66913), (385, 53009), (395, 51667), (427, 47795), (553, 36905), (605, 33733), (671, 30415), (847, 24095), (869, 23485), (2135, 9559), (2765, 7381), (3355, 6083), (4235, 4819), (4345, 4697)]