21807160

素因数分解:

$2^3\times 5^1\times {\mathrm{67}}^1\times {\mathrm{79}}^1\times {\mathrm{103}}^1$

素因数の和:260

約数の個数: 64

約数和(自身を含む): 50918400

約数和(自身を除く): 29111240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 67, 79, 103, 134, 158, 206, 268, 316, 335, 395, 412, 515, 536, 632, 670, 790, 824, 1030, 1340, 1580, 2060, 2680, 3160, 4120, 5293, 6901, 8137, 10586, 13802, 16274, 21172, 26465, 27604, 32548, 34505, 40685, 42344, 52930, 55208, 65096, 69010, 81370, 105860, 138020, 162740, 211720, 276040, 325480, 545179, 1090358, 2180716, 2725895, 4361432, 5451790, 10903580, 21807160]

約数ペア:

[(1, 21807160), (2, 10903580), (4, 5451790), (5, 4361432), (8, 2725895), (10, 2180716), (20, 1090358), (40, 545179), (67, 325480), (79, 276040), (103, 211720), (134, 162740), (158, 138020), (206, 105860), (268, 81370), (316, 69010), (335, 65096), (395, 55208), (412, 52930), (515, 42344), (536, 40685), (632, 34505), (670, 32548), (790, 27604), (824, 26465), (1030, 21172), (1340, 16274), (1580, 13802), (2060, 10586), (2680, 8137), (3160, 6901), (4120, 5293)]