19911680

素因数分解:

$2^{10}\times 5^1\times {\mathrm{3889}}^1$

素因数の和:3914

約数の個数: 44

約数和(自身を含む): 47776980

約数和(自身を除く): 27865300

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1024, 1280, 2560, 3889, 5120, 7778, 15556, 19445, 31112, 38890, 62224, 77780, 124448, 155560, 248896, 311120, 497792, 622240, 995584, 1244480, 1991168, 2488960, 3982336, 4977920, 9955840, 19911680]

約数ペア:

[(1, 19911680), (2, 9955840), (4, 4977920), (5, 3982336), (8, 2488960), (10, 1991168), (16, 1244480), (20, 995584), (32, 622240), (40, 497792), (64, 311120), (80, 248896), (128, 155560), (160, 124448), (256, 77780), (320, 62224), (512, 38890), (640, 31112), (1024, 19445), (1280, 15556), (2560, 7778), (3889, 5120)]