21181972

素因数分解:

$2^2\times 7^1\times {\mathrm{43}}^1\times {\mathrm{73}}^1\times {\mathrm{241}}^1$

素因数の和:368

約数の個数: 48

約数和(自身を含む): 44125312

約数和(自身を除く): 22943340

約数列:

[1, 2, 4, 7, 14, 28, 43, 73, 86, 146, 172, 241, 292, 301, 482, 511, 602, 964, 1022, 1204, 1687, 2044, 3139, 3374, 6278, 6748, 10363, 12556, 17593, 20726, 21973, 35186, 41452, 43946, 70372, 72541, 87892, 123151, 145082, 246302, 290164, 492604, 756499, 1512998, 3025996, 5295493, 10590986, 21181972]

約数ペア:

[(1, 21181972), (2, 10590986), (4, 5295493), (7, 3025996), (14, 1512998), (28, 756499), (43, 492604), (73, 290164), (86, 246302), (146, 145082), (172, 123151), (241, 87892), (292, 72541), (301, 70372), (482, 43946), (511, 41452), (602, 35186), (964, 21973), (1022, 20726), (1204, 17593), (1687, 12556), (2044, 10363), (3139, 6748), (3374, 6278)]