20687440

素因数分解:

$2^4\times 5^1\times {\mathrm{29}}^1\times {\mathrm{37}}^1\times {\mathrm{241}}^1$

素因数の和:320

約数の個数: 80

約数和(自身を含む): 51313680

約数和(自身を除く): 30626240

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 29, 37, 40, 58, 74, 80, 116, 145, 148, 185, 232, 241, 290, 296, 370, 464, 482, 580, 592, 740, 964, 1073, 1160, 1205, 1480, 1928, 2146, 2320, 2410, 2960, 3856, 4292, 4820, 5365, 6989, 8584, 8917, 9640, 10730, 13978, 17168, 17834, 19280, 21460, 27956, 34945, 35668, 42920, 44585, 55912, 69890, 71336, 85840, 89170, 111824, 139780, 142672, 178340, 258593, 279560, 356680, 517186, 559120, 713360, 1034372, 1292965, 2068744, 2585930, 4137488, 5171860, 10343720, 20687440]

約数ペア:

[(1, 20687440), (2, 10343720), (4, 5171860), (5, 4137488), (8, 2585930), (10, 2068744), (16, 1292965), (20, 1034372), (29, 713360), (37, 559120), (40, 517186), (58, 356680), (74, 279560), (80, 258593), (116, 178340), (145, 142672), (148, 139780), (185, 111824), (232, 89170), (241, 85840), (290, 71336), (296, 69890), (370, 55912), (464, 44585), (482, 42920), (580, 35668), (592, 34945), (740, 27956), (964, 21460), (1073, 19280), (1160, 17834), (1205, 17168), (1480, 13978), (1928, 10730), (2146, 9640), (2320, 8917), (2410, 8584), (2960, 6989), (3856, 5365), (4292, 4820)]