21201580

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{277}}^1$

素因数の和:418

約数の個数: 48

約数和(自身を含む): 46236960

約数和(自身を除く): 25035380

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 89, 172, 178, 215, 277, 356, 430, 445, 554, 860, 890, 1108, 1385, 1780, 2770, 3827, 5540, 7654, 11911, 15308, 19135, 23822, 24653, 38270, 47644, 49306, 59555, 76540, 98612, 119110, 123265, 238220, 246530, 493060, 1060079, 2120158, 4240316, 5300395, 10600790, 21201580]

約数ペア:

[(1, 21201580), (2, 10600790), (4, 5300395), (5, 4240316), (10, 2120158), (20, 1060079), (43, 493060), (86, 246530), (89, 238220), (172, 123265), (178, 119110), (215, 98612), (277, 76540), (356, 59555), (430, 49306), (445, 47644), (554, 38270), (860, 24653), (890, 23822), (1108, 19135), (1385, 15308), (1780, 11911), (2770, 7654), (3827, 5540)]