20858180

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{383}}^1\times {\mathrm{389}}^1$

素因数の和:788

約数の個数: 48

約数和(自身を含む): 50319360

約数和(自身を除く): 29461180

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 383, 389, 766, 778, 1532, 1556, 1915, 1945, 2681, 2723, 3830, 3890, 5362, 5446, 7660, 7780, 10724, 10892, 13405, 13615, 26810, 27230, 53620, 54460, 148987, 297974, 595948, 744935, 1042909, 1489870, 2085818, 2979740, 4171636, 5214545, 10429090, 20858180]

約数ペア:

[(1, 20858180), (2, 10429090), (4, 5214545), (5, 4171636), (7, 2979740), (10, 2085818), (14, 1489870), (20, 1042909), (28, 744935), (35, 595948), (70, 297974), (140, 148987), (383, 54460), (389, 53620), (766, 27230), (778, 26810), (1532, 13615), (1556, 13405), (1915, 10892), (1945, 10724), (2681, 7780), (2723, 7660), (3830, 5446), (3890, 5362)]