21721149

素因数分解:

$3^3\times {\mathrm{43}}^1\times {\mathrm{53}}^1\times {\mathrm{353}}^1$

素因数の和:458

約数の個数: 32

約数和(自身を含む): 33644160

約数和(自身を除く): 11923011

約数列:

[1, 3, 9, 27, 43, 53, 129, 159, 353, 387, 477, 1059, 1161, 1431, 2279, 3177, 6837, 9531, 15179, 18709, 20511, 45537, 56127, 61533, 136611, 168381, 409833, 505143, 804487, 2413461, 7240383, 21721149]

約数ペア:

[(1, 21721149), (3, 7240383), (9, 2413461), (27, 804487), (43, 505143), (53, 409833), (129, 168381), (159, 136611), (353, 61533), (387, 56127), (477, 45537), (1059, 20511), (1161, 18709), (1431, 15179), (2279, 9531), (3177, 6837)]