21881420

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{79}}^1\times {\mathrm{1259}}^1$

素因数の和:1358

約数の個数: 48

約数和(自身を含む): 50803200

約数和(自身を除く): 28921780

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 79, 110, 158, 220, 316, 395, 790, 869, 1259, 1580, 1738, 2518, 3476, 4345, 5036, 6295, 8690, 12590, 13849, 17380, 25180, 27698, 55396, 69245, 99461, 138490, 198922, 276980, 397844, 497305, 994610, 1094071, 1989220, 2188142, 4376284, 5470355, 10940710, 21881420]

約数ペア:

[(1, 21881420), (2, 10940710), (4, 5470355), (5, 4376284), (10, 2188142), (11, 1989220), (20, 1094071), (22, 994610), (44, 497305), (55, 397844), (79, 276980), (110, 198922), (158, 138490), (220, 99461), (316, 69245), (395, 55396), (790, 27698), (869, 25180), (1259, 17380), (1580, 13849), (1738, 12590), (2518, 8690), (3476, 6295), (4345, 5036)]