21405904

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{102913}}^1$

素因数の和:102934

約数の個数: 20

約数和(自身を含む): 44664676

約数和(自身を除く): 23258772

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 102913, 205826, 411652, 823304, 1337869, 1646608, 2675738, 5351476, 10702952, 21405904]

約数ペア:

[(1, 21405904), (2, 10702952), (4, 5351476), (8, 2675738), (13, 1646608), (16, 1337869), (26, 823304), (52, 411652), (104, 205826), (208, 102913)]