21791817

素因数分解:

$3^2\times {\mathrm{67}}^1\times {\mathrm{71}}^1\times {\mathrm{509}}^1$

素因数の和:653

約数の個数: 24

約数和(自身を含む): 32460480

約数和(自身を除く): 10668663

約数列:

[1, 3, 9, 67, 71, 201, 213, 509, 603, 639, 1527, 4581, 4757, 14271, 34103, 36139, 42813, 102309, 108417, 306927, 325251, 2421313, 7263939, 21791817]

約数ペア:

[(1, 21791817), (3, 7263939), (9, 2421313), (67, 325251), (71, 306927), (201, 108417), (213, 102309), (509, 42813), (603, 36139), (639, 34103), (1527, 14271), (4581, 4757)]