21216420

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{311}}^1\times {\mathrm{379}}^1$

素因数の和:705

約数の個数: 72

約数和(自身を含む): 64733760

約数和(自身を除く): 43517340

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180, 311, 379, 622, 758, 933, 1137, 1244, 1516, 1555, 1866, 1895, 2274, 2799, 3110, 3411, 3732, 3790, 4548, 4665, 5598, 5685, 6220, 6822, 7580, 9330, 11196, 11370, 13644, 13995, 17055, 18660, 22740, 27990, 34110, 55980, 68220, 117869, 235738, 353607, 471476, 589345, 707214, 1060821, 1178690, 1414428, 1768035, 2121642, 2357380, 3536070, 4243284, 5304105, 7072140, 10608210, 21216420]

約数ペア:

[(1, 21216420), (2, 10608210), (3, 7072140), (4, 5304105), (5, 4243284), (6, 3536070), (9, 2357380), (10, 2121642), (12, 1768035), (15, 1414428), (18, 1178690), (20, 1060821), (30, 707214), (36, 589345), (45, 471476), (60, 353607), (90, 235738), (180, 117869), (311, 68220), (379, 55980), (622, 34110), (758, 27990), (933, 22740), (1137, 18660), (1244, 17055), (1516, 13995), (1555, 13644), (1866, 11370), (1895, 11196), (2274, 9330), (2799, 7580), (3110, 6822), (3411, 6220), (3732, 5685), (3790, 5598), (4548, 4665)]