21809156620

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{3919}}^2$

素因数の和:7918

約数の個数: 36

約数和(自身を含む): 46456142544

約数和(自身を除く): 24646985924

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420, 3919, 7838, 15676, 19595, 39190, 78380, 278249, 556498, 1112996, 1391245, 2782490, 5564980, 15358561, 30717122, 61434244, 76792805, 153585610, 307171220, 1090457831, 2180915662, 4361831324, 5452289155, 10904578310, 21809156620]

約数ペア:

[(1, 21809156620), (2, 10904578310), (4, 5452289155), (5, 4361831324), (10, 2180915662), (20, 1090457831), (71, 307171220), (142, 153585610), (284, 76792805), (355, 61434244), (710, 30717122), (1420, 15358561), (3919, 5564980), (7838, 2782490), (15676, 1391245), (19595, 1112996), (39190, 556498), (78380, 278249)]