18815979

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{157}}^1\times {\mathrm{439}}^1$

素因数の和:619

約数の個数: 32

約数和(自身を含む): 31144960

約数和(自身を除く): 12328981

約数列:

[1, 3, 7, 13, 21, 39, 91, 157, 273, 439, 471, 1099, 1317, 2041, 3073, 3297, 5707, 6123, 9219, 14287, 17121, 39949, 42861, 68923, 119847, 206769, 482461, 895999, 1447383, 2687997, 6271993, 18815979]

約数ペア:

[(1, 18815979), (3, 6271993), (7, 2687997), (13, 1447383), (21, 895999), (39, 482461), (91, 206769), (157, 119847), (273, 68923), (439, 42861), (471, 39949), (1099, 17121), (1317, 14287), (2041, 9219), (3073, 6123), (3297, 5707)]