320440420

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{390781}}^1$

素因数の和:390831

約数の個数: 24

約数和(自身を含む): 689339448

約数和(自身を除く): 368899028

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 390781, 781562, 1563124, 1953905, 3907810, 7815620, 16022021, 32044042, 64088084, 80110105, 160220210, 320440420]

約数ペア:

[(1, 320440420), (2, 160220210), (4, 80110105), (5, 64088084), (10, 32044042), (20, 16022021), (41, 7815620), (82, 3907810), (164, 1953905), (205, 1563124), (410, 781562), (820, 390781)]