21780920

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{107}}^1\times {\mathrm{727}}^1$

素因数の和:852

約数の個数: 64

約数和(自身を含む): 56609280

約数和(自身を除く): 34828360

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 107, 140, 214, 280, 428, 535, 727, 749, 856, 1070, 1454, 1498, 2140, 2908, 2996, 3635, 3745, 4280, 5089, 5816, 5992, 7270, 7490, 10178, 14540, 14980, 20356, 25445, 29080, 29960, 40712, 50890, 77789, 101780, 155578, 203560, 311156, 388945, 544523, 622312, 777890, 1089046, 1555780, 2178092, 2722615, 3111560, 4356184, 5445230, 10890460, 21780920]

約数ペア:

[(1, 21780920), (2, 10890460), (4, 5445230), (5, 4356184), (7, 3111560), (8, 2722615), (10, 2178092), (14, 1555780), (20, 1089046), (28, 777890), (35, 622312), (40, 544523), (56, 388945), (70, 311156), (107, 203560), (140, 155578), (214, 101780), (280, 77789), (428, 50890), (535, 40712), (727, 29960), (749, 29080), (856, 25445), (1070, 20356), (1454, 14980), (1498, 14540), (2140, 10178), (2908, 7490), (2996, 7270), (3635, 5992), (3745, 5816), (4280, 5089)]