21192980

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{1297}}^1$

素因数の和:1368

約数の個数: 48

約数和(自身を含む): 47974080

約数和(自身を除く): 26781100

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 43, 76, 86, 95, 172, 190, 215, 380, 430, 817, 860, 1297, 1634, 2594, 3268, 4085, 5188, 6485, 8170, 12970, 16340, 24643, 25940, 49286, 55771, 98572, 111542, 123215, 223084, 246430, 278855, 492860, 557710, 1059649, 1115420, 2119298, 4238596, 5298245, 10596490, 21192980]

約数ペア:

[(1, 21192980), (2, 10596490), (4, 5298245), (5, 4238596), (10, 2119298), (19, 1115420), (20, 1059649), (38, 557710), (43, 492860), (76, 278855), (86, 246430), (95, 223084), (172, 123215), (190, 111542), (215, 98572), (380, 55771), (430, 49286), (817, 25940), (860, 24643), (1297, 16340), (1634, 12970), (2594, 8170), (3268, 6485), (4085, 5188)]