21380256

素因数分解:

$2^5\times 3^2\times {\mathrm{61}}^1\times {\mathrm{1217}}^1$

素因数の和:1294

約数の個数: 72

約数和(自身を含む): 61847604

約数和(自身を除く): 40467348

約数列:

[1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 32, 36, 48, 61, 72, 96, 122, 144, 183, 244, 288, 366, 488, 549, 732, 976, 1098, 1217, 1464, 1952, 2196, 2434, 2928, 3651, 4392, 4868, 5856, 7302, 8784, 9736, 10953, 14604, 17568, 19472, 21906, 29208, 38944, 43812, 58416, 74237, 87624, 116832, 148474, 175248, 222711, 296948, 350496, 445422, 593896, 668133, 890844, 1187792, 1336266, 1781688, 2375584, 2672532, 3563376, 5345064, 7126752, 10690128, 21380256]

約数ペア:

[(1, 21380256), (2, 10690128), (3, 7126752), (4, 5345064), (6, 3563376), (8, 2672532), (9, 2375584), (12, 1781688), (16, 1336266), (18, 1187792), (24, 890844), (32, 668133), (36, 593896), (48, 445422), (61, 350496), (72, 296948), (96, 222711), (122, 175248), (144, 148474), (183, 116832), (244, 87624), (288, 74237), (366, 58416), (488, 43812), (549, 38944), (732, 29208), (976, 21906), (1098, 19472), (1217, 17568), (1464, 14604), (1952, 10953), (2196, 9736), (2434, 8784), (2928, 7302), (3651, 5856), (4392, 4868)]