21491288

素因数分解:

$2^3\times 7^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{557}}^1$

素因数の和:636

約数の個数: 64

約数和(自身を含む): 50621760

約数和(自身を除く): 29130472

約数列:

[1, 2, 4, 7, 8, 13, 14, 26, 28, 52, 53, 56, 91, 104, 106, 182, 212, 364, 371, 424, 557, 689, 728, 742, 1114, 1378, 1484, 2228, 2756, 2968, 3899, 4456, 4823, 5512, 7241, 7798, 9646, 14482, 15596, 19292, 28964, 29521, 31192, 38584, 50687, 57928, 59042, 101374, 118084, 202748, 206647, 236168, 383773, 405496, 413294, 767546, 826588, 1535092, 1653176, 2686411, 3070184, 5372822, 10745644, 21491288]

約数ペア:

[(1, 21491288), (2, 10745644), (4, 5372822), (7, 3070184), (8, 2686411), (13, 1653176), (14, 1535092), (26, 826588), (28, 767546), (52, 413294), (53, 405496), (56, 383773), (91, 236168), (104, 206647), (106, 202748), (182, 118084), (212, 101374), (364, 59042), (371, 57928), (424, 50687), (557, 38584), (689, 31192), (728, 29521), (742, 28964), (1114, 19292), (1378, 15596), (1484, 14482), (2228, 9646), (2756, 7798), (2968, 7241), (3899, 5512), (4456, 4823)]