21206871

素因数分解:

$3^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{19801}}^1$

素因数の和:19831

約数の個数: 24

約数和(自身を含む): 37069344

約数和(自身を除く): 15862473

約数列:

[1, 3, 7, 9, 17, 21, 51, 63, 119, 153, 357, 1071, 19801, 59403, 138607, 178209, 336617, 415821, 1009851, 1247463, 2356319, 3029553, 7068957, 21206871]

約数ペア:

[(1, 21206871), (3, 7068957), (7, 3029553), (9, 2356319), (17, 1247463), (21, 1009851), (51, 415821), (63, 336617), (119, 178209), (153, 138607), (357, 59403), (1071, 19801)]