21912009

素因数分解:

$3^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{97}}^1\times {\mathrm{347}}^1$

素因数の和:485

約数の個数: 32

約数和(自身を含む): 34922496

約数和(自身を除く): 13010487

約数列:

[1, 3, 7, 21, 31, 93, 97, 217, 291, 347, 651, 679, 1041, 2037, 2429, 3007, 7287, 9021, 10757, 21049, 32271, 33659, 63147, 75299, 100977, 225897, 235613, 706839, 1043429, 3130287, 7304003, 21912009]

約数ペア:

[(1, 21912009), (3, 7304003), (7, 3130287), (21, 1043429), (31, 706839), (93, 235613), (97, 225897), (217, 100977), (291, 75299), (347, 63147), (651, 33659), (679, 32271), (1041, 21049), (2037, 10757), (2429, 9021), (3007, 7287)]