21380475

素因数分解:

$3^1\times 5^2\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{409}}^1$

素因数の和:480

約数の個数: 48

約数和(自身を含む): 38435040

約数和(自身を除く): 17054565

約数列:

[1, 3, 5, 15, 17, 25, 41, 51, 75, 85, 123, 205, 255, 409, 425, 615, 697, 1025, 1227, 1275, 2045, 2091, 3075, 3485, 6135, 6953, 10225, 10455, 16769, 17425, 20859, 30675, 34765, 50307, 52275, 83845, 104295, 173825, 251535, 285073, 419225, 521475, 855219, 1257675, 1425365, 4276095, 7126825, 21380475]

約数ペア:

[(1, 21380475), (3, 7126825), (5, 4276095), (15, 1425365), (17, 1257675), (25, 855219), (41, 521475), (51, 419225), (75, 285073), (85, 251535), (123, 173825), (205, 104295), (255, 83845), (409, 52275), (425, 50307), (615, 34765), (697, 30675), (1025, 20859), (1227, 17425), (1275, 16769), (2045, 10455), (2091, 10225), (3075, 6953), (3485, 6135)]