21017421

素因数分解:

$3^3\times {\mathrm{239}}^1\times {\mathrm{3257}}^1$

素因数の和:3505

約数の個数: 16

約数和(自身を含む): 31276800

約数和(自身を除く): 10259379

約数列:

[1, 3, 9, 27, 239, 717, 2151, 3257, 6453, 9771, 29313, 87939, 778423, 2335269, 7005807, 21017421]

約数ペア:

[(1, 21017421), (3, 7005807), (9, 2335269), (27, 778423), (239, 87939), (717, 29313), (2151, 9771), (3257, 6453)]