21957520

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{491}}^1$

素因数の和:560

約数の個数: 80

約数和(自身を含む): 56371392

約数和(自身を除く): 34413872

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 43, 52, 65, 80, 86, 104, 130, 172, 208, 215, 260, 344, 430, 491, 520, 559, 688, 860, 982, 1040, 1118, 1720, 1964, 2236, 2455, 2795, 3440, 3928, 4472, 4910, 5590, 6383, 7856, 8944, 9820, 11180, 12766, 19640, 21113, 22360, 25532, 31915, 39280, 42226, 44720, 51064, 63830, 84452, 102128, 105565, 127660, 168904, 211130, 255320, 274469, 337808, 422260, 510640, 548938, 844520, 1097876, 1372345, 1689040, 2195752, 2744690, 4391504, 5489380, 10978760, 21957520]

約数ペア:

[(1, 21957520), (2, 10978760), (4, 5489380), (5, 4391504), (8, 2744690), (10, 2195752), (13, 1689040), (16, 1372345), (20, 1097876), (26, 844520), (40, 548938), (43, 510640), (52, 422260), (65, 337808), (80, 274469), (86, 255320), (104, 211130), (130, 168904), (172, 127660), (208, 105565), (215, 102128), (260, 84452), (344, 63830), (430, 51064), (491, 44720), (520, 42226), (559, 39280), (688, 31915), (860, 25532), (982, 22360), (1040, 21113), (1118, 19640), (1720, 12766), (1964, 11180), (2236, 9820), (2455, 8944), (2795, 7856), (3440, 6383), (3928, 5590), (4472, 4910)]