21278917

素因数分解:

${\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{113}}^1$

素因数の和:213

約数の個数: 32

約数和(自身を含む): 26593920

約数和(自身を除く): 5315003

約数列:

[1, 11, 17, 19, 53, 113, 187, 209, 323, 583, 901, 1007, 1243, 1921, 2147, 3553, 5989, 9911, 11077, 17119, 21131, 23617, 36499, 65879, 101813, 113791, 188309, 401489, 1119943, 1251701, 1934447, 21278917]

約数ペア:

[(1, 21278917), (11, 1934447), (17, 1251701), (19, 1119943), (53, 401489), (113, 188309), (187, 113791), (209, 101813), (323, 65879), (583, 36499), (901, 23617), (1007, 21131), (1243, 17119), (1921, 11077), (2147, 9911), (3553, 5989)]