21091887

素因数分解:

$3^3\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{491}}^1$

素因数の和:580

約数の個数: 32

約数和(自身を含む): 32904960

約数和(自身を除く): 11813073

約数列:

[1, 3, 9, 27, 37, 43, 111, 129, 333, 387, 491, 999, 1161, 1473, 1591, 4419, 4773, 13257, 14319, 18167, 21113, 42957, 54501, 63339, 163503, 190017, 490509, 570051, 781181, 2343543, 7030629, 21091887]

約数ペア:

[(1, 21091887), (3, 7030629), (9, 2343543), (27, 781181), (37, 570051), (43, 490509), (111, 190017), (129, 163503), (333, 63339), (387, 54501), (491, 42957), (999, 21113), (1161, 18167), (1473, 14319), (1591, 13257), (4419, 4773)]