20530520

素因数分解:

$2^3\times 5^1\times {\mathrm{73}}^1\times {\mathrm{79}}^1\times {\mathrm{89}}^1$

素因数の和:252

約数の個数: 64

約数和(自身を含む): 47952000

約数和(自身を除く): 27421480

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 73, 79, 89, 146, 158, 178, 292, 316, 356, 365, 395, 445, 584, 632, 712, 730, 790, 890, 1460, 1580, 1780, 2920, 3160, 3560, 5767, 6497, 7031, 11534, 12994, 14062, 23068, 25988, 28124, 28835, 32485, 35155, 46136, 51976, 56248, 57670, 64970, 70310, 115340, 129940, 140620, 230680, 259880, 281240, 513263, 1026526, 2053052, 2566315, 4106104, 5132630, 10265260, 20530520]

約数ペア:

[(1, 20530520), (2, 10265260), (4, 5132630), (5, 4106104), (8, 2566315), (10, 2053052), (20, 1026526), (40, 513263), (73, 281240), (79, 259880), (89, 230680), (146, 140620), (158, 129940), (178, 115340), (292, 70310), (316, 64970), (356, 57670), (365, 56248), (395, 51976), (445, 46136), (584, 35155), (632, 32485), (712, 28835), (730, 28124), (790, 25988), (890, 23068), (1460, 14062), (1580, 12994), (1780, 11534), (2920, 7031), (3160, 6497), (3560, 5767)]