21449360

素因数分解:

$2^4\times 5^1\times {\mathrm{197}}^1\times {\mathrm{1361}}^1$

素因数の和:1571

約数の個数: 40

約数和(自身を含む): 50159736

約数和(自身を除く): 28710376

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 197, 394, 788, 985, 1361, 1576, 1970, 2722, 3152, 3940, 5444, 6805, 7880, 10888, 13610, 15760, 21776, 27220, 54440, 108880, 268117, 536234, 1072468, 1340585, 2144936, 2681170, 4289872, 5362340, 10724680, 21449360]

約数ペア:

[(1, 21449360), (2, 10724680), (4, 5362340), (5, 4289872), (8, 2681170), (10, 2144936), (16, 1340585), (20, 1072468), (40, 536234), (80, 268117), (197, 108880), (394, 54440), (788, 27220), (985, 21776), (1361, 15760), (1576, 13610), (1970, 10888), (2722, 7880), (3152, 6805), (3940, 5444)]