21392890

素因数分解:

$2^1\times 5^1\times {\mathrm{239}}^1\times {\mathrm{8951}}^1$

素因数の和:9197

約数の個数: 16

約数和(自身を含む): 38672640

約数和(自身を除く): 17279750

約数列:

[1, 2, 5, 10, 239, 478, 1195, 2390, 8951, 17902, 44755, 89510, 2139289, 4278578, 10696445, 21392890]

約数ペア:

[(1, 21392890), (2, 10696445), (5, 4278578), (10, 2139289), (239, 89510), (478, 44755), (1195, 17902), (2390, 8951)]