21539440

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{139}}^1\times {\mathrm{149}}^1$

素因数の和:314

約数の個数: 80

約数和(自身を含む): 54684000

約数和(自身を除く): 33144560

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 139, 149, 208, 260, 278, 298, 520, 556, 596, 695, 745, 1040, 1112, 1192, 1390, 1490, 1807, 1937, 2224, 2384, 2780, 2980, 3614, 3874, 5560, 5960, 7228, 7748, 9035, 9685, 11120, 11920, 14456, 15496, 18070, 19370, 20711, 28912, 30992, 36140, 38740, 41422, 72280, 77480, 82844, 103555, 144560, 154960, 165688, 207110, 269243, 331376, 414220, 538486, 828440, 1076972, 1346215, 1656880, 2153944, 2692430, 4307888, 5384860, 10769720, 21539440]

約数ペア:

[(1, 21539440), (2, 10769720), (4, 5384860), (5, 4307888), (8, 2692430), (10, 2153944), (13, 1656880), (16, 1346215), (20, 1076972), (26, 828440), (40, 538486), (52, 414220), (65, 331376), (80, 269243), (104, 207110), (130, 165688), (139, 154960), (149, 144560), (208, 103555), (260, 82844), (278, 77480), (298, 72280), (520, 41422), (556, 38740), (596, 36140), (695, 30992), (745, 28912), (1040, 20711), (1112, 19370), (1192, 18070), (1390, 15496), (1490, 14456), (1807, 11920), (1937, 11120), (2224, 9685), (2384, 9035), (2780, 7748), (2980, 7228), (3614, 5960), (3874, 5560)]