21917960

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{12743}}^1$

素因数の和:12797

約数の個数: 32

約数和(自身を含む): 50466240

約数和(自身を除く): 28548280

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 12743, 25486, 50972, 63715, 101944, 127430, 254860, 509720, 547949, 1095898, 2191796, 2739745, 4383592, 5479490, 10958980, 21917960]

約数ペア:

[(1, 21917960), (2, 10958980), (4, 5479490), (5, 4383592), (8, 2739745), (10, 2191796), (20, 1095898), (40, 547949), (43, 509720), (86, 254860), (172, 127430), (215, 101944), (344, 63715), (430, 50972), (860, 25486), (1720, 12743)]