21204280

素因数分解:

$2^3\times 5^1\times {\mathrm{641}}^1\times {\mathrm{827}}^1$

素因数の和:1479

約数の個数: 32

約数和(自身を含む): 47841840

約数和(自身を除く): 26637560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 641, 827, 1282, 1654, 2564, 3205, 3308, 4135, 5128, 6410, 6616, 8270, 12820, 16540, 25640, 33080, 530107, 1060214, 2120428, 2650535, 4240856, 5301070, 10602140, 21204280]

約数ペア:

[(1, 21204280), (2, 10602140), (4, 5301070), (5, 4240856), (8, 2650535), (10, 2120428), (20, 1060214), (40, 530107), (641, 33080), (827, 25640), (1282, 16540), (1654, 12820), (2564, 8270), (3205, 6616), (3308, 6410), (4135, 5128)]