21808904

素因数分解:

$2^3\times {\mathrm{13}}^1\times {\mathrm{209701}}^1$

素因数の和:209720

約数の個数: 16

約数和(自身を含む): 44037420

約数和(自身を除く): 22228516

約数列:

[1, 2, 4, 8, 13, 26, 52, 104, 209701, 419402, 838804, 1677608, 2726113, 5452226, 10904452, 21808904]

約数ペア:

[(1, 21808904), (2, 10904452), (4, 5452226), (8, 2726113), (13, 1677608), (26, 838804), (52, 419402), (104, 209701)]