20391903

素因数分解:

$3^2\times 7^1\times {\mathrm{431}}^1\times {\mathrm{751}}^1$

素因数の和:1195

約数の個数: 24

約数和(自身を含む): 33785856

約数和(自身を除く): 13393953

約数列:

[1, 3, 7, 9, 21, 63, 431, 751, 1293, 2253, 3017, 3879, 5257, 6759, 9051, 15771, 27153, 47313, 323681, 971043, 2265767, 2913129, 6797301, 20391903]

約数ペア:

[(1, 20391903), (3, 6797301), (7, 2913129), (9, 2265767), (21, 971043), (63, 323681), (431, 47313), (751, 27153), (1293, 15771), (2253, 9051), (3017, 6759), (3879, 5257)]