20385280

素因数分解:

$2^9\times 5^1\times {\mathrm{7963}}^1$

素因数の和:7986

約数の個数: 40

約数和(自身を含む): 48883032

約数和(自身を除く): 28497752

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1280, 2560, 7963, 15926, 31852, 39815, 63704, 79630, 127408, 159260, 254816, 318520, 509632, 637040, 1019264, 1274080, 2038528, 2548160, 4077056, 5096320, 10192640, 20385280]

約数ペア:

[(1, 20385280), (2, 10192640), (4, 5096320), (5, 4077056), (8, 2548160), (10, 2038528), (16, 1274080), (20, 1019264), (32, 637040), (40, 509632), (64, 318520), (80, 254816), (128, 159260), (160, 127408), (256, 79630), (320, 63704), (512, 39815), (640, 31852), (1280, 15926), (2560, 7963)]