21009872

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{101009}}^1$

素因数の和:101030

約数の個数: 20

約数和(自身を含む): 43838340

約数和(自身を除く): 22828468

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 101009, 202018, 404036, 808072, 1313117, 1616144, 2626234, 5252468, 10504936, 21009872]

約数ペア:

[(1, 21009872), (2, 10504936), (4, 5252468), (8, 2626234), (13, 1616144), (16, 1313117), (26, 808072), (52, 404036), (104, 202018), (208, 101009)]