21979881

素因数分解:

$3^2\times 7^2\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{197}}^1$

素因数の和:251

約数の個数: 72

約数和(自身を含む): 42254784

約数和(自身を除く): 20274903

約数列:

[1, 3, 7, 9, 11, 21, 23, 33, 49, 63, 69, 77, 99, 147, 161, 197, 207, 231, 253, 441, 483, 539, 591, 693, 759, 1127, 1379, 1449, 1617, 1771, 1773, 2167, 2277, 3381, 4137, 4531, 4851, 5313, 6501, 9653, 10143, 12397, 12411, 13593, 15169, 15939, 19503, 28959, 31717, 37191, 40779, 45507, 49841, 86877, 95151, 106183, 111573, 136521, 149523, 222019, 285453, 318549, 348887, 448569, 666057, 955647, 1046661, 1998171, 2442209, 3139983, 7326627, 21979881]

約数ペア:

[(1, 21979881), (3, 7326627), (7, 3139983), (9, 2442209), (11, 1998171), (21, 1046661), (23, 955647), (33, 666057), (49, 448569), (63, 348887), (69, 318549), (77, 285453), (99, 222019), (147, 149523), (161, 136521), (197, 111573), (207, 106183), (231, 95151), (253, 86877), (441, 49841), (483, 45507), (539, 40779), (591, 37191), (693, 31717), (759, 28959), (1127, 19503), (1379, 15939), (1449, 15169), (1617, 13593), (1771, 12411), (1773, 12397), (2167, 10143), (2277, 9653), (3381, 6501), (4137, 5313), (4531, 4851)]