21720571821

素因数分解:

$3^3\times {\mathrm{13}}^1\times {\mathrm{61881971}}^1$

素因数の和:61881993

約数の個数: 16

約数和(自身を含む): 34653904320

約数和(自身を除く): 12933332499

約数列:

[1, 3, 9, 13, 27, 39, 117, 351, 61881971, 185645913, 556937739, 804465623, 1670813217, 2413396869, 7240190607, 21720571821]

約数ペア:

[(1, 21720571821), (3, 7240190607), (9, 2413396869), (13, 1670813217), (27, 804465623), (39, 556937739), (117, 185645913), (351, 61881971)]