19980999

素因数分解:

$3^4\times {\mathrm{37}}^1\times {\mathrm{59}}^1\times {\mathrm{113}}^1$

素因数の和:221

約数の個数: 40

約数和(自身を含む): 31450320

約数和(自身を除く): 11469321

約数列:

[1, 3, 9, 27, 37, 59, 81, 111, 113, 177, 333, 339, 531, 999, 1017, 1593, 2183, 2997, 3051, 4181, 4779, 6549, 6667, 9153, 12543, 19647, 20001, 37629, 58941, 60003, 112887, 176823, 180009, 246679, 338661, 540027, 740037, 2220111, 6660333, 19980999]

約数ペア:

[(1, 19980999), (3, 6660333), (9, 2220111), (27, 740037), (37, 540027), (59, 338661), (81, 246679), (111, 180009), (113, 176823), (177, 112887), (333, 60003), (339, 58941), (531, 37629), (999, 20001), (1017, 19647), (1593, 12543), (2183, 9153), (2997, 6667), (3051, 6549), (4181, 4779)]