21076720

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{61}}^1\times {\mathrm{617}}^1$

素因数の和:698

約数の個数: 80

約数和(自身を含む): 57014208

約数和(自身を除く): 35937488

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 61, 70, 80, 112, 122, 140, 244, 280, 305, 427, 488, 560, 610, 617, 854, 976, 1220, 1234, 1708, 2135, 2440, 2468, 3085, 3416, 4270, 4319, 4880, 4936, 6170, 6832, 8540, 8638, 9872, 12340, 17080, 17276, 21595, 24680, 34160, 34552, 37637, 43190, 49360, 69104, 75274, 86380, 150548, 172760, 188185, 263459, 301096, 345520, 376370, 526918, 602192, 752740, 1053836, 1317295, 1505480, 2107672, 2634590, 3010960, 4215344, 5269180, 10538360, 21076720]

約数ペア:

[(1, 21076720), (2, 10538360), (4, 5269180), (5, 4215344), (7, 3010960), (8, 2634590), (10, 2107672), (14, 1505480), (16, 1317295), (20, 1053836), (28, 752740), (35, 602192), (40, 526918), (56, 376370), (61, 345520), (70, 301096), (80, 263459), (112, 188185), (122, 172760), (140, 150548), (244, 86380), (280, 75274), (305, 69104), (427, 49360), (488, 43190), (560, 37637), (610, 34552), (617, 34160), (854, 24680), (976, 21595), (1220, 17276), (1234, 17080), (1708, 12340), (2135, 9872), (2440, 8638), (2468, 8540), (3085, 6832), (3416, 6170), (4270, 4936), (4319, 4880)]