21137960

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{12889}}^1$

素因数の和:12941

約数の個数: 32

約数和(自身を含む): 48724200

約数和(自身を除く): 27586240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 12889, 25778, 51556, 64445, 103112, 128890, 257780, 515560, 528449, 1056898, 2113796, 2642245, 4227592, 5284490, 10568980, 21137960]

約数ペア:

[(1, 21137960), (2, 10568980), (4, 5284490), (5, 4227592), (8, 2642245), (10, 2113796), (20, 1056898), (40, 528449), (41, 515560), (82, 257780), (164, 128890), (205, 103112), (328, 64445), (410, 51556), (820, 25778), (1640, 12889)]