19987737

素因数分解:

$3^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{47}}^1\times {\mathrm{263}}^1$

素因数の和:338

約数の個数: 48

約数和(自身を含む): 34670592

約数和(自身を除く): 14682855

約数列:

[1, 3, 7, 11, 21, 33, 47, 49, 77, 141, 147, 231, 263, 329, 517, 539, 789, 987, 1551, 1617, 1841, 2303, 2893, 3619, 5523, 6909, 8679, 10857, 12361, 12887, 20251, 25333, 37083, 38661, 60753, 75999, 86527, 135971, 141757, 259581, 407913, 425271, 605689, 951797, 1817067, 2855391, 6662579, 19987737]

約数ペア:

[(1, 19987737), (3, 6662579), (7, 2855391), (11, 1817067), (21, 951797), (33, 605689), (47, 425271), (49, 407913), (77, 259581), (141, 141757), (147, 135971), (231, 86527), (263, 75999), (329, 60753), (517, 38661), (539, 37083), (789, 25333), (987, 20251), (1551, 12887), (1617, 12361), (1841, 10857), (2303, 8679), (2893, 6909), (3619, 5523)]