21881205

素因数分解:

$3^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{1487}}^1$

素因数の和:1610

約数の個数: 32

約数和(自身を含む): 39283200

約数和(自身を除く): 17401995

約数列:

[1, 3, 5, 9, 15, 27, 45, 109, 135, 327, 545, 981, 1487, 1635, 2943, 4461, 4905, 7435, 13383, 14715, 22305, 40149, 66915, 162083, 200745, 486249, 810415, 1458747, 2431245, 4376241, 7293735, 21881205]

約数ペア:

[(1, 21881205), (3, 7293735), (5, 4376241), (9, 2431245), (15, 1458747), (27, 810415), (45, 486249), (109, 200745), (135, 162083), (327, 66915), (545, 40149), (981, 22305), (1487, 14715), (1635, 13383), (2943, 7435), (4461, 4905)]