21115480

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{109}}^1\times {\mathrm{167}}^1$

素因数の和:316

約数の個数: 64

約数和(自身を含む): 49896000

約数和(自身を除く): 28780520

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 58, 109, 116, 145, 167, 218, 232, 290, 334, 436, 545, 580, 668, 835, 872, 1090, 1160, 1336, 1670, 2180, 3161, 3340, 4360, 4843, 6322, 6680, 9686, 12644, 15805, 18203, 19372, 24215, 25288, 31610, 36406, 38744, 48430, 63220, 72812, 91015, 96860, 126440, 145624, 182030, 193720, 364060, 527887, 728120, 1055774, 2111548, 2639435, 4223096, 5278870, 10557740, 21115480]

約数ペア:

[(1, 21115480), (2, 10557740), (4, 5278870), (5, 4223096), (8, 2639435), (10, 2111548), (20, 1055774), (29, 728120), (40, 527887), (58, 364060), (109, 193720), (116, 182030), (145, 145624), (167, 126440), (218, 96860), (232, 91015), (290, 72812), (334, 63220), (436, 48430), (545, 38744), (580, 36406), (668, 31610), (835, 25288), (872, 24215), (1090, 19372), (1160, 18203), (1336, 15805), (1670, 12644), (2180, 9686), (3161, 6680), (3340, 6322), (4360, 4843)]