21218720

素因数分解:

$2^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{269}}^1$

素因数の和:330

約数の個数: 96

約数和(自身を含む): 55112400

約数和(自身を除く): 33893680

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 29, 32, 34, 40, 58, 68, 80, 85, 116, 136, 145, 160, 170, 232, 269, 272, 290, 340, 464, 493, 538, 544, 580, 680, 928, 986, 1076, 1160, 1345, 1360, 1972, 2152, 2320, 2465, 2690, 2720, 3944, 4304, 4573, 4640, 4930, 5380, 7801, 7888, 8608, 9146, 9860, 10760, 15602, 15776, 18292, 19720, 21520, 22865, 31204, 36584, 39005, 39440, 43040, 45730, 62408, 73168, 78010, 78880, 91460, 124816, 132617, 146336, 156020, 182920, 249632, 265234, 312040, 365840, 530468, 624080, 663085, 731680, 1060936, 1248160, 1326170, 2121872, 2652340, 4243744, 5304680, 10609360, 21218720]

約数ペア:

[(1, 21218720), (2, 10609360), (4, 5304680), (5, 4243744), (8, 2652340), (10, 2121872), (16, 1326170), (17, 1248160), (20, 1060936), (29, 731680), (32, 663085), (34, 624080), (40, 530468), (58, 365840), (68, 312040), (80, 265234), (85, 249632), (116, 182920), (136, 156020), (145, 146336), (160, 132617), (170, 124816), (232, 91460), (269, 78880), (272, 78010), (290, 73168), (340, 62408), (464, 45730), (493, 43040), (538, 39440), (544, 39005), (580, 36584), (680, 31204), (928, 22865), (986, 21520), (1076, 19720), (1160, 18292), (1345, 15776), (1360, 15602), (1972, 10760), (2152, 9860), (2320, 9146), (2465, 8608), (2690, 7888), (2720, 7801), (3944, 5380), (4304, 4930), (4573, 4640)]