21169840

素因数分解:

$2^4\times 5^1\times {\mathrm{409}}^1\times {\mathrm{647}}^1$

素因数の和:1069

約数の個数: 40

約数和(自身を含む): 49416480

約数和(自身を除く): 28246640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 409, 647, 818, 1294, 1636, 2045, 2588, 3235, 3272, 4090, 5176, 6470, 6544, 8180, 10352, 12940, 16360, 25880, 32720, 51760, 264623, 529246, 1058492, 1323115, 2116984, 2646230, 4233968, 5292460, 10584920, 21169840]

約数ペア:

[(1, 21169840), (2, 10584920), (4, 5292460), (5, 4233968), (8, 2646230), (10, 2116984), (16, 1323115), (20, 1058492), (40, 529246), (80, 264623), (409, 51760), (647, 32720), (818, 25880), (1294, 16360), (1636, 12940), (2045, 10352), (2588, 8180), (3235, 6544), (3272, 6470), (4090, 5176)]