21881840

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{6361}}^1$

素因数の和:6417

約数の個数: 40

約数和(自身を含む): 52066608

約数和(自身を除く): 30184768

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 80, 86, 172, 215, 344, 430, 688, 860, 1720, 3440, 6361, 12722, 25444, 31805, 50888, 63610, 101776, 127220, 254440, 273523, 508880, 547046, 1094092, 1367615, 2188184, 2735230, 4376368, 5470460, 10940920, 21881840]

約数ペア:

[(1, 21881840), (2, 10940920), (4, 5470460), (5, 4376368), (8, 2735230), (10, 2188184), (16, 1367615), (20, 1094092), (40, 547046), (43, 508880), (80, 273523), (86, 254440), (172, 127220), (215, 101776), (344, 63610), (430, 50888), (688, 31805), (860, 25444), (1720, 12722), (3440, 6361)]