21625720

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8863}}^1$

素因数の和:8935

約数の個数: 32

約数和(自身を含む): 49461120

約数和(自身を除く): 27835400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8863, 17726, 35452, 44315, 70904, 88630, 177260, 354520, 540643, 1081286, 2162572, 2703215, 4325144, 5406430, 10812860, 21625720]

約数ペア:

[(1, 21625720), (2, 10812860), (4, 5406430), (5, 4325144), (8, 2703215), (10, 2162572), (20, 1081286), (40, 540643), (61, 354520), (122, 177260), (244, 88630), (305, 70904), (488, 44315), (610, 35452), (1220, 17726), (2440, 8863)]