21142280

素因数分解:

$2^3\times 5^1\times {\mathrm{541}}^1\times {\mathrm{977}}^1$

素因数の和:1529

約数の個数: 32

約数和(自身を含む): 47706840

約数和(自身を除く): 26564560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 541, 977, 1082, 1954, 2164, 2705, 3908, 4328, 4885, 5410, 7816, 9770, 10820, 19540, 21640, 39080, 528557, 1057114, 2114228, 2642785, 4228456, 5285570, 10571140, 21142280]

約数ペア:

[(1, 21142280), (2, 10571140), (4, 5285570), (5, 4228456), (8, 2642785), (10, 2114228), (20, 1057114), (40, 528557), (541, 39080), (977, 21640), (1082, 19540), (1954, 10820), (2164, 9770), (2705, 7816), (3908, 5410), (4328, 4885)]