21979280

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6701}}^1$

素因数の和:6755

約数の個数: 40

約数和(自身を含む): 52356024

約数和(自身を除く): 30376744

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6701, 13402, 26804, 33505, 53608, 67010, 107216, 134020, 268040, 274741, 536080, 549482, 1098964, 1373705, 2197928, 2747410, 4395856, 5494820, 10989640, 21979280]

約数ペア:

[(1, 21979280), (2, 10989640), (4, 5494820), (5, 4395856), (8, 2747410), (10, 2197928), (16, 1373705), (20, 1098964), (40, 549482), (41, 536080), (80, 274741), (82, 268040), (164, 134020), (205, 107216), (328, 67010), (410, 53608), (656, 33505), (820, 26804), (1640, 13402), (3280, 6701)]