21287049

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{1721}}^1$

素因数の和:1781

約数の個数: 32

約数和(自身を含む): 35266560

約数和(自身を除く): 13979511

約数列:

[1, 3, 7, 19, 21, 31, 57, 93, 133, 217, 399, 589, 651, 1721, 1767, 4123, 5163, 12047, 12369, 32699, 36141, 53351, 98097, 160053, 228893, 373457, 686679, 1013669, 1120371, 3041007, 7095683, 21287049]

約数ペア:

[(1, 21287049), (3, 7095683), (7, 3041007), (19, 1120371), (21, 1013669), (31, 686679), (57, 373457), (93, 228893), (133, 160053), (217, 98097), (399, 53351), (589, 36141), (651, 32699), (1721, 12369), (1767, 12047), (4123, 5163)]