21811280

素因数分解:

$2^4\times 5^1\times {\mathrm{103}}^1\times {\mathrm{2647}}^1$

素因数の和:2763

約数の個数: 40

約数和(自身を含む): 51222912

約数和(自身を除く): 29411632

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 103, 206, 412, 515, 824, 1030, 1648, 2060, 2647, 4120, 5294, 8240, 10588, 13235, 21176, 26470, 42352, 52940, 105880, 211760, 272641, 545282, 1090564, 1363205, 2181128, 2726410, 4362256, 5452820, 10905640, 21811280]

約数ペア:

[(1, 21811280), (2, 10905640), (4, 5452820), (5, 4362256), (8, 2726410), (10, 2181128), (16, 1363205), (20, 1090564), (40, 545282), (80, 272641), (103, 211760), (206, 105880), (412, 52940), (515, 42352), (824, 26470), (1030, 21176), (1648, 13235), (2060, 10588), (2647, 8240), (4120, 5294)]