21490905

素因数分解:

$3^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{113}}^1\times {\mathrm{409}}^1$

素因数の和:561

約数の個数: 32

約数和(自身を含む): 35896320

約数和(自身を除く): 14405415

約数列:

[1, 3, 5, 15, 31, 93, 113, 155, 339, 409, 465, 565, 1227, 1695, 2045, 3503, 6135, 10509, 12679, 17515, 38037, 46217, 52545, 63395, 138651, 190185, 231085, 693255, 1432727, 4298181, 7163635, 21490905]

約数ペア:

[(1, 21490905), (3, 7163635), (5, 4298181), (15, 1432727), (31, 693255), (93, 231085), (113, 190185), (155, 138651), (339, 63395), (409, 52545), (465, 46217), (565, 38037), (1227, 17515), (1695, 12679), (2045, 10509), (3503, 6135)]