20805399

素因数分解:

$3^2\times {\mathrm{17}}^2\times {\mathrm{19}}^1\times {\mathrm{421}}^1$

素因数の和:480

約数の個数: 36

約数和(自身を含む): 33684040

約数和(自身を除く): 12878641

約数列:

[1, 3, 9, 17, 19, 51, 57, 153, 171, 289, 323, 421, 867, 969, 1263, 2601, 2907, 3789, 5491, 7157, 7999, 16473, 21471, 23997, 49419, 64413, 71991, 121669, 135983, 365007, 407949, 1095021, 1223847, 2311711, 6935133, 20805399]

約数ペア:

[(1, 20805399), (3, 6935133), (9, 2311711), (17, 1223847), (19, 1095021), (51, 407949), (57, 365007), (153, 135983), (171, 121669), (289, 71991), (323, 64413), (421, 49419), (867, 23997), (969, 21471), (1263, 16473), (2601, 7999), (2907, 7157), (3789, 5491)]