21719965

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{59}}^1\times {\mathrm{61}}^1\times {\mathrm{71}}^1$

素因数の和:213

約数の個数: 32

約数和(自身を含む): 28926720

約数和(自身を除く): 7206755

約数列:

[1, 5, 17, 59, 61, 71, 85, 295, 305, 355, 1003, 1037, 1207, 3599, 4189, 4331, 5015, 5185, 6035, 17995, 20945, 21655, 61183, 71213, 73627, 255529, 305915, 356065, 368135, 1277645, 4343993, 21719965]

約数ペア:

[(1, 21719965), (5, 4343993), (17, 1277645), (59, 368135), (61, 356065), (71, 305915), (85, 255529), (295, 73627), (305, 71213), (355, 61183), (1003, 21655), (1037, 20945), (1207, 17995), (3599, 6035), (4189, 5185), (4331, 5015)]