21388521

素因数分解:

$3^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{53}}^1\times {\mathrm{1747}}^1$

素因数の和:1821

約数の個数: 32

約数和(自身を含む): 36246528

約数和(自身を除く): 14858007

約数列:

[1, 3, 7, 11, 21, 33, 53, 77, 159, 231, 371, 583, 1113, 1747, 1749, 4081, 5241, 12229, 12243, 19217, 36687, 57651, 92591, 134519, 277773, 403557, 648137, 1018501, 1944411, 3055503, 7129507, 21388521]

約数ペア:

[(1, 21388521), (3, 7129507), (7, 3055503), (11, 1944411), (21, 1018501), (33, 648137), (53, 403557), (77, 277773), (159, 134519), (231, 92591), (371, 57651), (583, 36687), (1113, 19217), (1747, 12243), (1749, 12229), (4081, 5241)]