21497620

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{67}}^1\times {\mathrm{263}}^1$

素因数の和:400

約数の個数: 48

約数和(自身を含む): 46747008

約数和(自身を除く): 25249388

約数列:

[1, 2, 4, 5, 10, 20, 61, 67, 122, 134, 244, 263, 268, 305, 335, 526, 610, 670, 1052, 1220, 1315, 1340, 2630, 4087, 5260, 8174, 16043, 16348, 17621, 20435, 32086, 35242, 40870, 64172, 70484, 80215, 81740, 88105, 160430, 176210, 320860, 352420, 1074881, 2149762, 4299524, 5374405, 10748810, 21497620]

約数ペア:

[(1, 21497620), (2, 10748810), (4, 5374405), (5, 4299524), (10, 2149762), (20, 1074881), (61, 352420), (67, 320860), (122, 176210), (134, 160430), (244, 88105), (263, 81740), (268, 80215), (305, 70484), (335, 64172), (526, 40870), (610, 35242), (670, 32086), (1052, 20435), (1220, 17621), (1315, 16348), (1340, 16043), (2630, 8174), (4087, 5260)]