21254212

素因数分解:

$2^2\times 7^1\times {\mathrm{43}}^1\times {\mathrm{127}}^1\times {\mathrm{139}}^1$

素因数の和:320

約数の個数: 48

約数和(自身を含む): 44154880

約数和(自身を除く): 22900668

約数列:

[1, 2, 4, 7, 14, 28, 43, 86, 127, 139, 172, 254, 278, 301, 508, 556, 602, 889, 973, 1204, 1778, 1946, 3556, 3892, 5461, 5977, 10922, 11954, 17653, 21844, 23908, 35306, 38227, 41839, 70612, 76454, 83678, 123571, 152908, 167356, 247142, 494284, 759079, 1518158, 3036316, 5313553, 10627106, 21254212]

約数ペア:

[(1, 21254212), (2, 10627106), (4, 5313553), (7, 3036316), (14, 1518158), (28, 759079), (43, 494284), (86, 247142), (127, 167356), (139, 152908), (172, 123571), (254, 83678), (278, 76454), (301, 70612), (508, 41839), (556, 38227), (602, 35306), (889, 23908), (973, 21844), (1204, 17653), (1778, 11954), (1946, 10922), (3556, 5977), (3892, 5461)]