81358720

素因数分解:

$2^7\times 5^1\times {\mathrm{127123}}^1$

素因数の和:127142

約数の個数: 32

約数和(自身を含む): 194499720

約数和(自身を除く): 113141000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 127123, 254246, 508492, 635615, 1016984, 1271230, 2033968, 2542460, 4067936, 5084920, 8135872, 10169840, 16271744, 20339680, 40679360, 81358720]

約数ペア:

[(1, 81358720), (2, 40679360), (4, 20339680), (5, 16271744), (8, 10169840), (10, 8135872), (16, 5084920), (20, 4067936), (32, 2542460), (40, 2033968), (64, 1271230), (80, 1016984), (128, 635615), (160, 508492), (320, 254246), (640, 127123)]