21491860

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{131}}^1\times {\mathrm{631}}^1$

素因数の和:784

約数の個数: 48

約数和(自身を含む): 49053312

約数和(自身を除く): 27561452

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 131, 260, 262, 524, 631, 655, 1262, 1310, 1703, 2524, 2620, 3155, 3406, 6310, 6812, 8203, 8515, 12620, 16406, 17030, 32812, 34060, 41015, 82030, 82661, 164060, 165322, 330644, 413305, 826610, 1074593, 1653220, 2149186, 4298372, 5372965, 10745930, 21491860]

約数ペア:

[(1, 21491860), (2, 10745930), (4, 5372965), (5, 4298372), (10, 2149186), (13, 1653220), (20, 1074593), (26, 826610), (52, 413305), (65, 330644), (130, 165322), (131, 164060), (260, 82661), (262, 82030), (524, 41015), (631, 34060), (655, 32812), (1262, 17030), (1310, 16406), (1703, 12620), (2524, 8515), (2620, 8203), (3155, 6812), (3406, 6310)]