21305710

素因数分解:

$2^1\times 5^1\times {\mathrm{37}}^1\times {\mathrm{89}}^1\times {\mathrm{647}}^1$

素因数の和:780

約数の個数: 32

約数和(自身を含む): 39890880

約数和(自身を除く): 18585170

約数列:

[1, 2, 5, 10, 37, 74, 89, 178, 185, 370, 445, 647, 890, 1294, 3235, 3293, 6470, 6586, 16465, 23939, 32930, 47878, 57583, 115166, 119695, 239390, 287915, 575830, 2130571, 4261142, 10652855, 21305710]

約数ペア:

[(1, 21305710), (2, 10652855), (5, 4261142), (10, 2130571), (37, 575830), (74, 287915), (89, 239390), (178, 119695), (185, 115166), (370, 57583), (445, 47878), (647, 32930), (890, 23939), (1294, 16465), (3235, 6586), (3293, 6470)]