21528909

素因数分解:

$3^4\times {\mathrm{67}}^1\times {\mathrm{3967}}^1$

素因数の和:4046

約数の個数: 20

約数和(自身を含む): 32648704

約数和(自身を除く): 11119795

約数列:

[1, 3, 9, 27, 67, 81, 201, 603, 1809, 3967, 5427, 11901, 35703, 107109, 265789, 321327, 797367, 2392101, 7176303, 21528909]

約数ペア:

[(1, 21528909), (3, 7176303), (9, 2392101), (27, 797367), (67, 321327), (81, 265789), (201, 107109), (603, 35703), (1809, 11901), (3967, 5427)]