20516805

素因数分解:

$3^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{461}}^1$

素因数の和:538

約数の個数: 48

約数和(自身を含む): 38054016

約数和(自身を除く): 17537211

約数列:

[1, 3, 5, 9, 15, 23, 43, 45, 69, 115, 129, 207, 215, 345, 387, 461, 645, 989, 1035, 1383, 1935, 2305, 2967, 4149, 4945, 6915, 8901, 10603, 14835, 19823, 20745, 31809, 44505, 53015, 59469, 95427, 99115, 159045, 178407, 297345, 455929, 477135, 892035, 1367787, 2279645, 4103361, 6838935, 20516805]

約数ペア:

[(1, 20516805), (3, 6838935), (5, 4103361), (9, 2279645), (15, 1367787), (23, 892035), (43, 477135), (45, 455929), (69, 297345), (115, 178407), (129, 159045), (207, 99115), (215, 95427), (345, 59469), (387, 53015), (461, 44505), (645, 31809), (989, 20745), (1035, 19823), (1383, 14835), (1935, 10603), (2305, 8901), (2967, 6915), (4149, 4945)]