21290121

素因数分解:

$3^4\times {\mathrm{67}}^1\times {\mathrm{3923}}^1$

素因数の和:4002

約数の個数: 20

約数和(自身を含む): 32286672

約数和(自身を除く): 10996551

約数列:

[1, 3, 9, 27, 67, 81, 201, 603, 1809, 3923, 5427, 11769, 35307, 105921, 262841, 317763, 788523, 2365569, 7096707, 21290121]

約数ペア:

[(1, 21290121), (3, 7096707), (9, 2365569), (27, 788523), (67, 317763), (81, 262841), (201, 105921), (603, 35307), (1809, 11769), (3923, 5427)]