19916897

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{101}}^1\times {\mathrm{197}}^1$

素因数の和:329

約数の個数: 32

約数和(自身を含む): 27143424

約数和(自身を除く): 7226527

約数列:

[1, 7, 11, 13, 77, 91, 101, 143, 197, 707, 1001, 1111, 1313, 1379, 2167, 2561, 7777, 9191, 14443, 15169, 17927, 19897, 28171, 101101, 139279, 197197, 218867, 258661, 1532069, 1810627, 2845271, 19916897]

約数ペア:

[(1, 19916897), (7, 2845271), (11, 1810627), (13, 1532069), (77, 258661), (91, 218867), (101, 197197), (143, 139279), (197, 101101), (707, 28171), (1001, 19897), (1111, 17927), (1313, 15169), (1379, 14443), (2167, 9191), (2561, 7777)]