21870387

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^2\times {\mathrm{19}}^1\times {\mathrm{151}}^1$

素因数の和:205

約数の個数: 72

約数和(自身を含む): 42049280

約数和(自身を除く): 20178893

約数列:

[1, 3, 7, 9, 11, 19, 21, 33, 57, 63, 77, 99, 121, 133, 151, 171, 209, 231, 363, 399, 453, 627, 693, 847, 1057, 1089, 1197, 1359, 1463, 1661, 1881, 2299, 2541, 2869, 3171, 4389, 4983, 6897, 7623, 8607, 9513, 11627, 13167, 14949, 16093, 18271, 20083, 20691, 25821, 31559, 34881, 48279, 54813, 60249, 94677, 104643, 127897, 144837, 164439, 180747, 220913, 284031, 347149, 383691, 662739, 1041447, 1151073, 1988217, 2430043, 3124341, 7290129, 21870387]

約数ペア:

[(1, 21870387), (3, 7290129), (7, 3124341), (9, 2430043), (11, 1988217), (19, 1151073), (21, 1041447), (33, 662739), (57, 383691), (63, 347149), (77, 284031), (99, 220913), (121, 180747), (133, 164439), (151, 144837), (171, 127897), (209, 104643), (231, 94677), (363, 60249), (399, 54813), (453, 48279), (627, 34881), (693, 31559), (847, 25821), (1057, 20691), (1089, 20083), (1197, 18271), (1359, 16093), (1463, 14949), (1661, 13167), (1881, 11627), (2299, 9513), (2541, 8607), (2869, 7623), (3171, 6897), (4389, 4983)]