21281990

素因数分解:

$2^1\times 5^1\times {\mathrm{43}}^2\times {\mathrm{1151}}^1$

素因数の和:1244

約数の個数: 24

約数和(自身を含む): 39253248

約数和(自身を除く): 17971258

約数列:

[1, 2, 5, 10, 43, 86, 215, 430, 1151, 1849, 2302, 3698, 5755, 9245, 11510, 18490, 49493, 98986, 247465, 494930, 2128199, 4256398, 10640995, 21281990]

約数ペア:

[(1, 21281990), (2, 10640995), (5, 4256398), (10, 2128199), (43, 494930), (86, 247465), (215, 98986), (430, 49493), (1151, 18490), (1849, 11510), (2302, 9245), (3698, 5755)]