21688855

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{61}}^1\times {\mathrm{89}}^1$

素因数の和:219

約数の個数: 32

約数和(自身を含む): 28926720

約数和(自身を除く): 7237865

約数列:

[1, 5, 17, 47, 61, 85, 89, 235, 305, 445, 799, 1037, 1513, 2867, 3995, 4183, 5185, 5429, 7565, 14335, 20915, 27145, 48739, 71111, 92293, 243695, 255163, 355555, 461465, 1275815, 4337771, 21688855]

約数ペア:

[(1, 21688855), (5, 4337771), (17, 1275815), (47, 461465), (61, 355555), (85, 255163), (89, 243695), (235, 92293), (305, 71111), (445, 48739), (799, 27145), (1037, 20915), (1513, 14335), (2867, 7565), (3995, 5429), (4183, 5185)]