21489680

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{6247}}^1$

素因数の和:6303

約数の個数: 40

約数和(自身を含む): 51133632

約数和(自身を除く): 29643952

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 80, 86, 172, 215, 344, 430, 688, 860, 1720, 3440, 6247, 12494, 24988, 31235, 49976, 62470, 99952, 124940, 249880, 268621, 499760, 537242, 1074484, 1343105, 2148968, 2686210, 4297936, 5372420, 10744840, 21489680]

約数ペア:

[(1, 21489680), (2, 10744840), (4, 5372420), (5, 4297936), (8, 2686210), (10, 2148968), (16, 1343105), (20, 1074484), (40, 537242), (43, 499760), (80, 268621), (86, 249880), (172, 124940), (215, 99952), (344, 62470), (430, 49976), (688, 31235), (860, 24988), (1720, 12494), (3440, 6247)]