21005810

素因数分解:

$2^1\times 5^1\times 7^2\times {\mathrm{163}}^1\times {\mathrm{263}}^1$

素因数の和:447

約数の個数: 48

約数和(自身を含む): 44421696

約数和(自身を除く): 23415886

約数列:

[1, 2, 5, 7, 10, 14, 35, 49, 70, 98, 163, 245, 263, 326, 490, 526, 815, 1141, 1315, 1630, 1841, 2282, 2630, 3682, 5705, 7987, 9205, 11410, 12887, 15974, 18410, 25774, 39935, 42869, 64435, 79870, 85738, 128870, 214345, 300083, 428690, 600166, 1500415, 2100581, 3000830, 4201162, 10502905, 21005810]

約数ペア:

[(1, 21005810), (2, 10502905), (5, 4201162), (7, 3000830), (10, 2100581), (14, 1500415), (35, 600166), (49, 428690), (70, 300083), (98, 214345), (163, 128870), (245, 85738), (263, 79870), (326, 64435), (490, 42869), (526, 39935), (815, 25774), (1141, 18410), (1315, 15974), (1630, 12887), (1841, 11410), (2282, 9205), (2630, 7987), (3682, 5705)]