20978195

素因数分解:

$5^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{53}}^1\times {\mathrm{263}}^1$

素因数の和:371

約数の個数: 32

約数和(自身を含む): 30108672

約数和(自身を除く): 9130477

約数列:

[1, 5, 7, 35, 43, 53, 215, 263, 265, 301, 371, 1315, 1505, 1841, 1855, 2279, 9205, 11309, 11395, 13939, 15953, 56545, 69695, 79163, 79765, 97573, 395815, 487865, 599377, 2996885, 4195639, 20978195]

約数ペア:

[(1, 20978195), (5, 4195639), (7, 2996885), (35, 599377), (43, 487865), (53, 395815), (215, 97573), (263, 79765), (265, 79163), (301, 69695), (371, 56545), (1315, 15953), (1505, 13939), (1841, 11395), (1855, 11309), (2279, 9205)]