21000304857

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{73}}^1\times {\mathrm{720991}}^1$

素因数の和:721093

約数の個数: 32

約数和(自身を含む): 34146181120

約数和(自身を除く): 13145876263

約数列:

[1, 3, 7, 19, 21, 57, 73, 133, 219, 399, 511, 1387, 1533, 4161, 9709, 29127, 720991, 2162973, 5046937, 13698829, 15140811, 41096487, 52632343, 95891803, 157897029, 287675409, 368426401, 1000014517, 1105279203, 3000043551, 7000101619, 21000304857]

約数ペア:

[(1, 21000304857), (3, 7000101619), (7, 3000043551), (19, 1105279203), (21, 1000014517), (57, 368426401), (73, 287675409), (133, 157897029), (219, 95891803), (399, 52632343), (511, 41096487), (1387, 15140811), (1533, 13698829), (4161, 5046937), (9709, 2162973), (29127, 720991)]