21180940

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{2239}}^1$

素因数の和:2302

約数の個数: 48

約数和(自身を含む): 49674240

約数和(自身を除く): 28493300

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 43, 44, 55, 86, 110, 172, 215, 220, 430, 473, 860, 946, 1892, 2239, 2365, 4478, 4730, 8956, 9460, 11195, 22390, 24629, 44780, 49258, 96277, 98516, 123145, 192554, 246290, 385108, 481385, 492580, 962770, 1059047, 1925540, 2118094, 4236188, 5295235, 10590470, 21180940]

約数ペア:

[(1, 21180940), (2, 10590470), (4, 5295235), (5, 4236188), (10, 2118094), (11, 1925540), (20, 1059047), (22, 962770), (43, 492580), (44, 481385), (55, 385108), (86, 246290), (110, 192554), (172, 123145), (215, 98516), (220, 96277), (430, 49258), (473, 44780), (860, 24629), (946, 22390), (1892, 11195), (2239, 9460), (2365, 8956), (4478, 4730)]