21038020

素因数分解:

$2^2\times 5^1\times {\mathrm{257}}^1\times {\mathrm{4093}}^1$

素因数の和:4359

約数の個数: 24

約数和(自身を含む): 44362584

約数和(自身を除く): 23324564

約数列:

[1, 2, 4, 5, 10, 20, 257, 514, 1028, 1285, 2570, 4093, 5140, 8186, 16372, 20465, 40930, 81860, 1051901, 2103802, 4207604, 5259505, 10519010, 21038020]

約数ペア:

[(1, 21038020), (2, 10519010), (4, 5259505), (5, 4207604), (10, 2103802), (20, 1051901), (257, 81860), (514, 40930), (1028, 20465), (1285, 16372), (2570, 8186), (4093, 5140)]