21688880

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^2\times {\mathrm{751}}^1$

素因数の和:802

約数の個数: 60

約数和(自身を含む): 53291232

約数和(自身を除く): 31602352

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 76, 80, 95, 152, 190, 304, 361, 380, 722, 751, 760, 1444, 1502, 1520, 1805, 2888, 3004, 3610, 3755, 5776, 6008, 7220, 7510, 12016, 14269, 14440, 15020, 28538, 28880, 30040, 57076, 60080, 71345, 114152, 142690, 228304, 271111, 285380, 542222, 570760, 1084444, 1141520, 1355555, 2168888, 2711110, 4337776, 5422220, 10844440, 21688880]

約数ペア:

[(1, 21688880), (2, 10844440), (4, 5422220), (5, 4337776), (8, 2711110), (10, 2168888), (16, 1355555), (19, 1141520), (20, 1084444), (38, 570760), (40, 542222), (76, 285380), (80, 271111), (95, 228304), (152, 142690), (190, 114152), (304, 71345), (361, 60080), (380, 57076), (722, 30040), (751, 28880), (760, 28538), (1444, 15020), (1502, 14440), (1520, 14269), (1805, 12016), (2888, 7510), (3004, 7220), (3610, 6008), (3755, 5776)]