21538405

素因数分解:

$5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{683}}^1$

素因数の和:765

約数の個数: 32

約数和(自身を含む): 31912704

約数和(自身を除く): 10374299

約数列:

[1, 5, 7, 17, 35, 53, 85, 119, 265, 371, 595, 683, 901, 1855, 3415, 4505, 4781, 6307, 11611, 23905, 31535, 36199, 58055, 81277, 180995, 253393, 406385, 615383, 1266965, 3076915, 4307681, 21538405]

約数ペア:

[(1, 21538405), (5, 4307681), (7, 3076915), (17, 1266965), (35, 615383), (53, 406385), (85, 253393), (119, 180995), (265, 81277), (371, 58055), (595, 36199), (683, 31535), (901, 23905), (1855, 11611), (3415, 6307), (4505, 4781)]