20921480

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{12757}}^1$

素因数の和:12809

約数の個数: 32

約数和(自身を含む): 48225240

約数和(自身を除く): 27303760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 12757, 25514, 51028, 63785, 102056, 127570, 255140, 510280, 523037, 1046074, 2092148, 2615185, 4184296, 5230370, 10460740, 20921480]

約数ペア:

[(1, 20921480), (2, 10460740), (4, 5230370), (5, 4184296), (8, 2615185), (10, 2092148), (20, 1046074), (40, 523037), (41, 510280), (82, 255140), (164, 127570), (205, 102056), (328, 63785), (410, 51028), (820, 25514), (1640, 12757)]