21256365

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{1787}}^1$

素因数の和:1869

約数の個数: 32

約数和(自身を含む): 37247616

約数和(自身を除く): 15991251

約数列:

[1, 3, 5, 13, 15, 39, 61, 65, 183, 195, 305, 793, 915, 1787, 2379, 3965, 5361, 8935, 11895, 23231, 26805, 69693, 109007, 116155, 327021, 348465, 545035, 1417091, 1635105, 4251273, 7085455, 21256365]

約数ペア:

[(1, 21256365), (3, 7085455), (5, 4251273), (13, 1635105), (15, 1417091), (39, 545035), (61, 348465), (65, 327021), (183, 116155), (195, 109007), (305, 69693), (793, 26805), (915, 23231), (1787, 11895), (2379, 8935), (3965, 5361)]