21328725

素因数分解:

$3^1\times 5^2\times {\mathrm{11}}^1\times {\mathrm{103}}^1\times {\mathrm{251}}^1$

素因数の和:378

約数の個数: 48

約数和(自身を含む): 38997504

約数和(自身を除く): 17668779

約数列:

[1, 3, 5, 11, 15, 25, 33, 55, 75, 103, 165, 251, 275, 309, 515, 753, 825, 1133, 1255, 1545, 2575, 2761, 3399, 3765, 5665, 6275, 7725, 8283, 13805, 16995, 18825, 25853, 28325, 41415, 69025, 77559, 84975, 129265, 207075, 284383, 387795, 646325, 853149, 1421915, 1938975, 4265745, 7109575, 21328725]

約数ペア:

[(1, 21328725), (3, 7109575), (5, 4265745), (11, 1938975), (15, 1421915), (25, 853149), (33, 646325), (55, 387795), (75, 284383), (103, 207075), (165, 129265), (251, 84975), (275, 77559), (309, 69025), (515, 41415), (753, 28325), (825, 25853), (1133, 18825), (1255, 16995), (1545, 13805), (2575, 8283), (2761, 7725), (3399, 6275), (3765, 5665)]