21209931

素因数分解:

$3^4\times {\mathrm{17}}^1\times {\mathrm{73}}^1\times {\mathrm{211}}^1$

素因数の和:313

約数の個数: 40

約数和(自身を含む): 34168464

約数和(自身を除く): 12958533

約数列:

[1, 3, 9, 17, 27, 51, 73, 81, 153, 211, 219, 459, 633, 657, 1241, 1377, 1899, 1971, 3587, 3723, 5697, 5913, 10761, 11169, 15403, 17091, 32283, 33507, 46209, 96849, 100521, 138627, 261851, 290547, 415881, 785553, 1247643, 2356659, 7069977, 21209931]

約数ペア:

[(1, 21209931), (3, 7069977), (9, 2356659), (17, 1247643), (27, 785553), (51, 415881), (73, 290547), (81, 261851), (153, 138627), (211, 100521), (219, 96849), (459, 46209), (633, 33507), (657, 32283), (1241, 17091), (1377, 15403), (1899, 11169), (1971, 10761), (3587, 5913), (3723, 5697)]