21681960

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{281}}^1\times {\mathrm{643}}^1$

素因数の和:938

約数の個数: 64

約数和(自身を含む): 65378880

約数和(自身を除く): 43696920

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120, 281, 562, 643, 843, 1124, 1286, 1405, 1686, 1929, 2248, 2572, 2810, 3215, 3372, 3858, 4215, 5144, 5620, 6430, 6744, 7716, 8430, 9645, 11240, 12860, 15432, 16860, 19290, 25720, 33720, 38580, 77160, 180683, 361366, 542049, 722732, 903415, 1084098, 1445464, 1806830, 2168196, 2710245, 3613660, 4336392, 5420490, 7227320, 10840980, 21681960]

約数ペア:

[(1, 21681960), (2, 10840980), (3, 7227320), (4, 5420490), (5, 4336392), (6, 3613660), (8, 2710245), (10, 2168196), (12, 1806830), (15, 1445464), (20, 1084098), (24, 903415), (30, 722732), (40, 542049), (60, 361366), (120, 180683), (281, 77160), (562, 38580), (643, 33720), (843, 25720), (1124, 19290), (1286, 16860), (1405, 15432), (1686, 12860), (1929, 11240), (2248, 9645), (2572, 8430), (2810, 7716), (3215, 6744), (3372, 6430), (3858, 5620), (4215, 5144)]