21206140

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{97}}^1\times {\mathrm{643}}^1$

素因数の和:766

約数の個数: 48

約数和(自身を含む): 47712672

約数和(自身を除く): 26506532

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 97, 170, 194, 340, 388, 485, 643, 970, 1286, 1649, 1940, 2572, 3215, 3298, 6430, 6596, 8245, 10931, 12860, 16490, 21862, 32980, 43724, 54655, 62371, 109310, 124742, 218620, 249484, 311855, 623710, 1060307, 1247420, 2120614, 4241228, 5301535, 10603070, 21206140]

約数ペア:

[(1, 21206140), (2, 10603070), (4, 5301535), (5, 4241228), (10, 2120614), (17, 1247420), (20, 1060307), (34, 623710), (68, 311855), (85, 249484), (97, 218620), (170, 124742), (194, 109310), (340, 62371), (388, 54655), (485, 43724), (643, 32980), (970, 21862), (1286, 16490), (1649, 12860), (1940, 10931), (2572, 8245), (3215, 6596), (3298, 6430)]