21815780

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{113}}^1\times {\mathrm{197}}^1$

素因数の和:333

約数の個数: 72

約数和(自身を含む): 54037368

約数和(自身を除く): 32221588

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 113, 140, 196, 197, 226, 245, 394, 452, 490, 565, 788, 791, 980, 985, 1130, 1379, 1582, 1970, 2260, 2758, 3164, 3940, 3955, 5516, 5537, 6895, 7910, 9653, 11074, 13790, 15820, 19306, 22148, 22261, 27580, 27685, 38612, 44522, 48265, 55370, 89044, 96530, 110740, 111305, 155827, 193060, 222610, 311654, 445220, 623308, 779135, 1090789, 1558270, 2181578, 3116540, 4363156, 5453945, 10907890, 21815780]

約数ペア:

[(1, 21815780), (2, 10907890), (4, 5453945), (5, 4363156), (7, 3116540), (10, 2181578), (14, 1558270), (20, 1090789), (28, 779135), (35, 623308), (49, 445220), (70, 311654), (98, 222610), (113, 193060), (140, 155827), (196, 111305), (197, 110740), (226, 96530), (245, 89044), (394, 55370), (452, 48265), (490, 44522), (565, 38612), (788, 27685), (791, 27580), (980, 22261), (985, 22148), (1130, 19306), (1379, 15820), (1582, 13790), (1970, 11074), (2260, 9653), (2758, 7910), (3164, 6895), (3940, 5537), (3955, 5516)]