20981373

素因数分解:

$3^1\times 7^1\times {\mathrm{79}}^1\times {\mathrm{12647}}^1$

素因数の和:12736

約数の個数: 16

約数和(自身を含む): 32378880

約数和(自身を除く): 11397507

約数列:

[1, 3, 7, 21, 79, 237, 553, 1659, 12647, 37941, 88529, 265587, 999113, 2997339, 6993791, 20981373]

約数ペア:

[(1, 20981373), (3, 6993791), (7, 2997339), (21, 999113), (79, 265587), (237, 88529), (553, 37941), (1659, 12647)]