21397743

素因数分解:

$3^3\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{787}}^1$

素因数の和:868

約数の個数: 32

約数和(自身を含む): 34041600

約数和(自身を除く): 12643857

約数列:

[1, 3, 9, 19, 27, 53, 57, 159, 171, 477, 513, 787, 1007, 1431, 2361, 3021, 7083, 9063, 14953, 21249, 27189, 41711, 44859, 125133, 134577, 375399, 403731, 792509, 1126197, 2377527, 7132581, 21397743]

約数ペア:

[(1, 21397743), (3, 7132581), (9, 2377527), (19, 1126197), (27, 792509), (53, 403731), (57, 375399), (159, 134577), (171, 125133), (477, 44859), (513, 41711), (787, 27189), (1007, 21249), (1431, 14953), (2361, 9063), (3021, 7083)]