20080180

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{89}}^1\times {\mathrm{389}}^1$

素因数の和:516

約数の個数: 48

約数和(自身を含む): 44226000

約数和(自身を除く): 24145820

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 89, 116, 145, 178, 290, 356, 389, 445, 580, 778, 890, 1556, 1780, 1945, 2581, 3890, 5162, 7780, 10324, 11281, 12905, 22562, 25810, 34621, 45124, 51620, 56405, 69242, 112810, 138484, 173105, 225620, 346210, 692420, 1004009, 2008018, 4016036, 5020045, 10040090, 20080180]

約数ペア:

[(1, 20080180), (2, 10040090), (4, 5020045), (5, 4016036), (10, 2008018), (20, 1004009), (29, 692420), (58, 346210), (89, 225620), (116, 173105), (145, 138484), (178, 112810), (290, 69242), (356, 56405), (389, 51620), (445, 45124), (580, 34621), (778, 25810), (890, 22562), (1556, 12905), (1780, 11281), (1945, 10324), (2581, 7780), (3890, 5162)]