21757060

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{41}}^1\times {\mathrm{157}}^1$

素因数の和:233

約数の個数: 72

約数和(自身を含む): 51004296

約数和(自身を除く): 29247236

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 41, 52, 65, 82, 130, 157, 164, 169, 205, 260, 314, 338, 410, 533, 628, 676, 785, 820, 845, 1066, 1570, 1690, 2041, 2132, 2665, 3140, 3380, 4082, 5330, 6437, 6929, 8164, 10205, 10660, 12874, 13858, 20410, 25748, 26533, 27716, 32185, 34645, 40820, 53066, 64370, 69290, 83681, 106132, 128740, 132665, 138580, 167362, 265330, 334724, 418405, 530660, 836810, 1087853, 1673620, 2175706, 4351412, 5439265, 10878530, 21757060]

約数ペア:

[(1, 21757060), (2, 10878530), (4, 5439265), (5, 4351412), (10, 2175706), (13, 1673620), (20, 1087853), (26, 836810), (41, 530660), (52, 418405), (65, 334724), (82, 265330), (130, 167362), (157, 138580), (164, 132665), (169, 128740), (205, 106132), (260, 83681), (314, 69290), (338, 64370), (410, 53066), (533, 40820), (628, 34645), (676, 32185), (785, 27716), (820, 26533), (845, 25748), (1066, 20410), (1570, 13858), (1690, 12874), (2041, 10660), (2132, 10205), (2665, 8164), (3140, 6929), (3380, 6437), (4082, 5330)]