21185320

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{131}}^1\times {\mathrm{311}}^1$

素因数の和:466

約数の個数: 64

約数和(自身を含む): 51891840

約数和(自身を除く): 30706520

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 131, 260, 262, 311, 520, 524, 622, 655, 1048, 1244, 1310, 1555, 1703, 2488, 2620, 3110, 3406, 4043, 5240, 6220, 6812, 8086, 8515, 12440, 13624, 16172, 17030, 20215, 32344, 34060, 40430, 40741, 68120, 80860, 81482, 161720, 162964, 203705, 325928, 407410, 529633, 814820, 1059266, 1629640, 2118532, 2648165, 4237064, 5296330, 10592660, 21185320]

約数ペア:

[(1, 21185320), (2, 10592660), (4, 5296330), (5, 4237064), (8, 2648165), (10, 2118532), (13, 1629640), (20, 1059266), (26, 814820), (40, 529633), (52, 407410), (65, 325928), (104, 203705), (130, 162964), (131, 161720), (260, 81482), (262, 80860), (311, 68120), (520, 40741), (524, 40430), (622, 34060), (655, 32344), (1048, 20215), (1244, 17030), (1310, 16172), (1555, 13624), (1703, 12440), (2488, 8515), (2620, 8086), (3110, 6812), (3406, 6220), (4043, 5240)]