21707920

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20873}}^1$

素因数の和:20899

約数の個数: 40

約数和(自身を含む): 54355896

約数和(自身を除く): 32647976

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20873, 41746, 83492, 104365, 166984, 208730, 271349, 333968, 417460, 542698, 834920, 1085396, 1356745, 1669840, 2170792, 2713490, 4341584, 5426980, 10853960, 21707920]

約数ペア:

[(1, 21707920), (2, 10853960), (4, 5426980), (5, 4341584), (8, 2713490), (10, 2170792), (13, 1669840), (16, 1356745), (20, 1085396), (26, 834920), (40, 542698), (52, 417460), (65, 333968), (80, 271349), (104, 208730), (130, 166984), (208, 104365), (260, 83492), (520, 41746), (1040, 20873)]