21380931

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{449}}^1$

素因数の和:516

約数の個数: 48

約数和(自身を含む): 37346400

約数和(自身を除く): 15965469

約数列:

[1, 3, 9, 11, 13, 33, 37, 39, 99, 111, 117, 143, 333, 407, 429, 449, 481, 1221, 1287, 1347, 1443, 3663, 4041, 4329, 4939, 5291, 5837, 14817, 15873, 16613, 17511, 44451, 47619, 49839, 52533, 64207, 149517, 182743, 192621, 215969, 548229, 577863, 647907, 1644687, 1943721, 2375659, 7126977, 21380931]

約数ペア:

[(1, 21380931), (3, 7126977), (9, 2375659), (11, 1943721), (13, 1644687), (33, 647907), (37, 577863), (39, 548229), (99, 215969), (111, 192621), (117, 182743), (143, 149517), (333, 64207), (407, 52533), (429, 49839), (449, 47619), (481, 44451), (1221, 17511), (1287, 16613), (1347, 15873), (1443, 14817), (3663, 5837), (4041, 5291), (4329, 4939)]