261312640

素因数分解:

$2^7\times 5^1\times {\mathrm{31}}^1\times {\mathrm{13171}}^1$

素因数の和:13221

約数の個数: 64

約数和(自身を含む): 644901120

約数和(自身を除く): 383588480

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 310, 320, 496, 620, 640, 992, 1240, 1984, 2480, 3968, 4960, 9920, 13171, 19840, 26342, 52684, 65855, 105368, 131710, 210736, 263420, 408301, 421472, 526840, 816602, 842944, 1053680, 1633204, 1685888, 2041505, 2107360, 3266408, 4083010, 4214720, 6532816, 8166020, 8429440, 13065632, 16332040, 26131264, 32664080, 52262528, 65328160, 130656320, 261312640]

約数ペア:

[(1, 261312640), (2, 130656320), (4, 65328160), (5, 52262528), (8, 32664080), (10, 26131264), (16, 16332040), (20, 13065632), (31, 8429440), (32, 8166020), (40, 6532816), (62, 4214720), (64, 4083010), (80, 3266408), (124, 2107360), (128, 2041505), (155, 1685888), (160, 1633204), (248, 1053680), (310, 842944), (320, 816602), (496, 526840), (620, 421472), (640, 408301), (992, 263420), (1240, 210736), (1984, 131710), (2480, 105368), (3968, 65855), (4960, 52684), (9920, 26342), (13171, 19840)]