21380895

素因数分解:

$3^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{1453}}^1$

素因数の和:1576

約数の個数: 32

約数和(自身を含む): 38385600

約数和(自身を除く): 17004705

約数列:

[1, 3, 5, 9, 15, 27, 45, 109, 135, 327, 545, 981, 1453, 1635, 2943, 4359, 4905, 7265, 13077, 14715, 21795, 39231, 65385, 158377, 196155, 475131, 791885, 1425393, 2375655, 4276179, 7126965, 21380895]

約数ペア:

[(1, 21380895), (3, 7126965), (5, 4276179), (9, 2375655), (15, 1425393), (27, 791885), (45, 475131), (109, 196155), (135, 158377), (327, 65385), (545, 39231), (981, 21795), (1453, 14715), (1635, 13077), (2943, 7265), (4359, 4905)]