21545840

素因数分解:

$2^4\times 5^1\times {\mathrm{29}}^1\times {\mathrm{37}}^1\times {\mathrm{251}}^1$

素因数の和:330

約数の個数: 80

約数和(自身を含む): 53434080

約数和(自身を除く): 31888240

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 29, 37, 40, 58, 74, 80, 116, 145, 148, 185, 232, 251, 290, 296, 370, 464, 502, 580, 592, 740, 1004, 1073, 1160, 1255, 1480, 2008, 2146, 2320, 2510, 2960, 4016, 4292, 5020, 5365, 7279, 8584, 9287, 10040, 10730, 14558, 17168, 18574, 20080, 21460, 29116, 36395, 37148, 42920, 46435, 58232, 72790, 74296, 85840, 92870, 116464, 145580, 148592, 185740, 269323, 291160, 371480, 538646, 582320, 742960, 1077292, 1346615, 2154584, 2693230, 4309168, 5386460, 10772920, 21545840]

約数ペア:

[(1, 21545840), (2, 10772920), (4, 5386460), (5, 4309168), (8, 2693230), (10, 2154584), (16, 1346615), (20, 1077292), (29, 742960), (37, 582320), (40, 538646), (58, 371480), (74, 291160), (80, 269323), (116, 185740), (145, 148592), (148, 145580), (185, 116464), (232, 92870), (251, 85840), (290, 74296), (296, 72790), (370, 58232), (464, 46435), (502, 42920), (580, 37148), (592, 36395), (740, 29116), (1004, 21460), (1073, 20080), (1160, 18574), (1255, 17168), (1480, 14558), (2008, 10730), (2146, 10040), (2320, 9287), (2510, 8584), (2960, 7279), (4016, 5365), (4292, 5020)]