21488920

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{13103}}^1$

素因数の和:13155

約数の個数: 32

約数和(自身を含む): 49533120

約数和(自身を除く): 28044200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 13103, 26206, 52412, 65515, 104824, 131030, 262060, 524120, 537223, 1074446, 2148892, 2686115, 4297784, 5372230, 10744460, 21488920]

約数ペア:

[(1, 21488920), (2, 10744460), (4, 5372230), (5, 4297784), (8, 2686115), (10, 2148892), (20, 1074446), (40, 537223), (41, 524120), (82, 262060), (164, 131030), (205, 104824), (328, 65515), (410, 52412), (820, 26206), (1640, 13103)]