20100920

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{71789}}^1$

素因数の和:71807

約数の個数: 32

約数和(自身を含む): 51688800

約数和(自身を除く): 31587880

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 71789, 143578, 287156, 358945, 502523, 574312, 717890, 1005046, 1435780, 2010092, 2512615, 2871560, 4020184, 5025230, 10050460, 20100920]

約数ペア:

[(1, 20100920), (2, 10050460), (4, 5025230), (5, 4020184), (7, 2871560), (8, 2512615), (10, 2010092), (14, 1435780), (20, 1005046), (28, 717890), (35, 574312), (40, 502523), (56, 358945), (70, 287156), (140, 143578), (280, 71789)]