81691960

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{197}}^1\times {\mathrm{1481}}^1$

素因数の和:1696

約数の個数: 64

約数和(自身を含む): 211273920

約数和(自身を除く): 129581960

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 197, 280, 394, 788, 985, 1379, 1481, 1576, 1970, 2758, 2962, 3940, 5516, 5924, 6895, 7405, 7880, 10367, 11032, 11848, 13790, 14810, 20734, 27580, 29620, 41468, 51835, 55160, 59240, 82936, 103670, 207340, 291757, 414680, 583514, 1167028, 1458785, 2042299, 2334056, 2917570, 4084598, 5835140, 8169196, 10211495, 11670280, 16338392, 20422990, 40845980, 81691960]

約数ペア:

[(1, 81691960), (2, 40845980), (4, 20422990), (5, 16338392), (7, 11670280), (8, 10211495), (10, 8169196), (14, 5835140), (20, 4084598), (28, 2917570), (35, 2334056), (40, 2042299), (56, 1458785), (70, 1167028), (140, 583514), (197, 414680), (280, 291757), (394, 207340), (788, 103670), (985, 82936), (1379, 59240), (1481, 55160), (1576, 51835), (1970, 41468), (2758, 29620), (2962, 27580), (3940, 20734), (5516, 14810), (5924, 13790), (6895, 11848), (7405, 11032), (7880, 10367)]