20921168

素因数分解:

$2^4\times {\mathrm{23}}^1\times {\mathrm{139}}^1\times {\mathrm{409}}^1$

素因数の和:579

約数の個数: 40

約数和(自身を含む): 42705600

約数和(自身を除く): 21784432

約数列:

[1, 2, 4, 8, 16, 23, 46, 92, 139, 184, 278, 368, 409, 556, 818, 1112, 1636, 2224, 3197, 3272, 6394, 6544, 9407, 12788, 18814, 25576, 37628, 51152, 56851, 75256, 113702, 150512, 227404, 454808, 909616, 1307573, 2615146, 5230292, 10460584, 20921168]

約数ペア:

[(1, 20921168), (2, 10460584), (4, 5230292), (8, 2615146), (16, 1307573), (23, 909616), (46, 454808), (92, 227404), (139, 150512), (184, 113702), (278, 75256), (368, 56851), (409, 51152), (556, 37628), (818, 25576), (1112, 18814), (1636, 12788), (2224, 9407), (3197, 6544), (3272, 6394)]