20000720

素因数分解:

$2^4\times 5^1\times {\mathrm{29}}^1\times {\mathrm{37}}^1\times {\mathrm{233}}^1$

素因数の和:312

約数の個数: 80

約数和(自身を含む): 49617360

約数和(自身を除く): 29616640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 29, 37, 40, 58, 74, 80, 116, 145, 148, 185, 232, 233, 290, 296, 370, 464, 466, 580, 592, 740, 932, 1073, 1160, 1165, 1480, 1864, 2146, 2320, 2330, 2960, 3728, 4292, 4660, 5365, 6757, 8584, 8621, 9320, 10730, 13514, 17168, 17242, 18640, 21460, 27028, 33785, 34484, 42920, 43105, 54056, 67570, 68968, 85840, 86210, 108112, 135140, 137936, 172420, 250009, 270280, 344840, 500018, 540560, 689680, 1000036, 1250045, 2000072, 2500090, 4000144, 5000180, 10000360, 20000720]

約数ペア:

[(1, 20000720), (2, 10000360), (4, 5000180), (5, 4000144), (8, 2500090), (10, 2000072), (16, 1250045), (20, 1000036), (29, 689680), (37, 540560), (40, 500018), (58, 344840), (74, 270280), (80, 250009), (116, 172420), (145, 137936), (148, 135140), (185, 108112), (232, 86210), (233, 85840), (290, 68968), (296, 67570), (370, 54056), (464, 43105), (466, 42920), (580, 34484), (592, 33785), (740, 27028), (932, 21460), (1073, 18640), (1160, 17242), (1165, 17168), (1480, 13514), (1864, 10730), (2146, 9320), (2320, 8621), (2330, 8584), (2960, 6757), (3728, 5365), (4292, 4660)]