20719556

素因数分解:

$2^2\times {\mathrm{11}}^2\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{89}}^1$

素因数の和:165

約数の個数: 72

約数和(自身を含む): 44576280

約数和(自身を除く): 23856724

約数列:

[1, 2, 4, 11, 13, 22, 26, 37, 44, 52, 74, 89, 121, 143, 148, 178, 242, 286, 356, 407, 481, 484, 572, 814, 962, 979, 1157, 1573, 1628, 1924, 1958, 2314, 3146, 3293, 3916, 4477, 4628, 5291, 6292, 6586, 8954, 10582, 10769, 12727, 13172, 17908, 21164, 21538, 25454, 36223, 42809, 43076, 50908, 58201, 72446, 85618, 116402, 139997, 144892, 171236, 232804, 279994, 398453, 470899, 559988, 796906, 941798, 1593812, 1883596, 5179889, 10359778, 20719556]

約数ペア:

[(1, 20719556), (2, 10359778), (4, 5179889), (11, 1883596), (13, 1593812), (22, 941798), (26, 796906), (37, 559988), (44, 470899), (52, 398453), (74, 279994), (89, 232804), (121, 171236), (143, 144892), (148, 139997), (178, 116402), (242, 85618), (286, 72446), (356, 58201), (407, 50908), (481, 43076), (484, 42809), (572, 36223), (814, 25454), (962, 21538), (979, 21164), (1157, 17908), (1573, 13172), (1628, 12727), (1924, 10769), (1958, 10582), (2314, 8954), (3146, 6586), (3293, 6292), (3916, 5291), (4477, 4628)]