20391568

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{1229}}^1$

素因数の和:1315

約数の個数: 40

約数和(自身を含む): 42553080

約数和(自身を除く): 22161512

約数列:

[1, 2, 4, 8, 16, 17, 34, 61, 68, 122, 136, 244, 272, 488, 976, 1037, 1229, 2074, 2458, 4148, 4916, 8296, 9832, 16592, 19664, 20893, 41786, 74969, 83572, 149938, 167144, 299876, 334288, 599752, 1199504, 1274473, 2548946, 5097892, 10195784, 20391568]

約数ペア:

[(1, 20391568), (2, 10195784), (4, 5097892), (8, 2548946), (16, 1274473), (17, 1199504), (34, 599752), (61, 334288), (68, 299876), (122, 167144), (136, 149938), (244, 83572), (272, 74969), (488, 41786), (976, 20893), (1037, 19664), (1229, 16592), (2074, 9832), (2458, 8296), (4148, 4916)]