21157851

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{149}}^1\times {\mathrm{331}}^1$

素因数の和:507

約数の個数: 32

約数和(自身を含む): 33465600

約数和(自身を除く): 12307749

約数列:

[1, 3, 11, 13, 33, 39, 143, 149, 331, 429, 447, 993, 1639, 1937, 3641, 4303, 4917, 5811, 10923, 12909, 21307, 47333, 49319, 63921, 141999, 147957, 542509, 641147, 1627527, 1923441, 7052617, 21157851]

約数ペア:

[(1, 21157851), (3, 7052617), (11, 1923441), (13, 1627527), (33, 641147), (39, 542509), (143, 147957), (149, 141999), (331, 63921), (429, 49319), (447, 47333), (993, 21307), (1639, 12909), (1937, 10923), (3641, 5811), (4303, 4917)]