20699980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{199}}^1\times {\mathrm{743}}^1$

素因数の和:958

約数の個数: 48

約数和(自身を含む): 49996800

約数和(自身を除く): 29296820

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 199, 398, 743, 796, 995, 1393, 1486, 1990, 2786, 2972, 3715, 3980, 5201, 5572, 6965, 7430, 10402, 13930, 14860, 20804, 26005, 27860, 52010, 104020, 147857, 295714, 591428, 739285, 1034999, 1478570, 2069998, 2957140, 4139996, 5174995, 10349990, 20699980]

約数ペア:

[(1, 20699980), (2, 10349990), (4, 5174995), (5, 4139996), (7, 2957140), (10, 2069998), (14, 1478570), (20, 1034999), (28, 739285), (35, 591428), (70, 295714), (140, 147857), (199, 104020), (398, 52010), (743, 27860), (796, 26005), (995, 20804), (1393, 14860), (1486, 13930), (1990, 10402), (2786, 7430), (2972, 6965), (3715, 5572), (3980, 5201)]